apt can't locate package

[gabrielssanches]

I've been able to successfully install the generated ISO from user-data.example as is.
But after adding any package (tried with net-tools and zsh), it fails to find the package.

Then I'm left with the console, and there I can just call apt install zsh manually and it works.
It fetches from archive.ubuntu.com and installs.

I guess its something very basic that I'm missing...

ISO configuration:
autoinstall: version: 1 identity: hostname: ubuntu-server password: "$6$exDY1mhS4KUYCE/2$zmn9ToZwTKLhCw.b4/b.ZRTIZM30JZ4QrOQ2aOXJ8yk96xpcCof0kxKwuX1kqLG/ygbJ1f8wxED22bTL4F46P0" username: ubuntu network: version: 2 ethernets: enp0s3: dhcp4: true package_update: 'true' packages: - zsh
detailed log regardinng zsh installation:
`
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install/cmd-install/stage-hook/builtin/cmd-hook: curtin command hook
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install/cmd-install/stage-hook/builtin/cmd-hook: curtin command hook
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install/cmd-install/stage-hook/builtin: running 'curtin hook'
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install/cmd-install/stage-hook: finalizing installation
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install/cmd-install/stage-late: executing late commands
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install/cmd-install/stage-late: executing late commands
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install/cmd-install: curtin command install
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/curtin_install: installing system
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall: final system configuration
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall/configure_cloud_init: configuring cloud-init
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Meta/status_GET
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall/configure_cloud_init: configuring cloud-init
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall/get_target_packages: calculating extra packages to install
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall/get_target_packages: calculating extra packages to install
Feb 15 16:18:45 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall/install_zsh: installing zsh
Feb 15 16:18:45 ubuntu-server systemd[1]: Started /snap/subiquity/3698/usr/bin/python3.8 -m curtin --showtrace -vvv --set json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2391.4"}} system-install -t /target -- zsh.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: start: cmd-system-install: curtin command system-install
Feb 15 16:18:46 ubuntu-server curtin_event.2391.4[15627]: start: cmd-system-install: curtin command system-install
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--bind', '/dev', '/target/dev'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--bind', '/proc', '/target/proc'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--bind', '/run', '/target/run'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--bind', '/sys', '/target/sys'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['unshare', '--help'] with allowed return codes [0] (capture=True)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['unshare', '--fork', '--pid', '--', 'chroot', '/target', 'eatmydata', 'apt-get', '--quiet', '--assume-yes', '--option=Dpkg::options::=--force-unsafe-io', '--option=Dpkg::Options::=--force-confold', 'install', 'zsh'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15638]: Reading package lists...
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15638]: Building dependency tree...
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15638]: Reading state information...
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15638]: E: Unable to locate package zsh
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: TIMED subp(['udevadm', 'settle']): 0.017
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/sys'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/sys'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/run'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server systemd[1]: target-sys.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/run'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/proc'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server systemd[1]: target-run.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/proc'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/dev'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server systemd[1]: target-proc.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/dev'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: system install failed for ['zsh']: Unexpected error while running command.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Command: ['unshare', '--fork', '--pid', '--', 'chroot', '/target', 'eatmydata', 'apt-get', '--quiet', '--assume-yes', '--option=Dpkg::options::=--force-unsafe-io', '--option=Dpkg::Options::=--force-confold', 'install', 'zsh']
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Exit code: 100
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Reason: -
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Stdout: ''
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Stderr: ''
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: finish: cmd-system-install: FAIL: curtin command system-install
Feb 15 16:18:46 ubuntu-server curtin_event.2391.4[15627]: finish: cmd-system-install: FAIL: curtin command system-install
Feb 15 16:18:46 ubuntu-server systemd[1]: target-dev.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server systemd[1]: run-u43.service: Main process exited, code=exited, status=100/n/a
Feb 15 16:18:46 ubuntu-server systemd[1]: run-u43.service: Failed with result 'exit-code'.
Feb 15 16:18:46 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall/install_zsh: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.2391', '--setenv', 'PATH=/snap/subiquity/3698/bin:/snap/subiquity/3698/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/3698/bin', '--setenv', 'PYTHONPATH=:/snap/subiquity/3698/lib/python3.8/site-packages', '--setenv', 'PYTHON=/snap/subiquity/3698/usr/bin/python3.8', '--setenv', 'SNAP=/snap/subiquity/3698', '--', '/snap/subiquity/3698/usr/bin/python3.8', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2391.4"}}', 'system-install', '-t', '/target', '--', 'zsh']' returned non-zero exit status 100.
Feb 15 16:18:46 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.2391', '--setenv', 'PATH=/snap/subiquity/3698/bin:/snap/subiquity/3698/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/3698/bin', '--setenv', 'PYTHONPATH=:/snap/subiquity/3698/lib/python3.8/site-packages', '--setenv', 'PYTHON=/snap/subiquity/3698/usr/bin/python3.8', '--setenv', 'SNAP=/snap/subiquity/3698', '--', '/snap/subiquity/3698/usr/bin/python3.8', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2391.4"}}', 'system-install', '-t', '/target', '--', 'zsh']' returned non-zero exit status 100.
Feb 15 16:18:46 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.2391', '--setenv', 'PATH=/snap/subiquity/3698/bin:/snap/subiquity/3698/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/3698/bin', '--setenv', 'PYTHONPATH=:/snap/subiquity/3698/lib/python3.8/site-packages', '--setenv', 'PYTHON=/snap/subiquity/3698/usr/bin/python3.8', '--setenv', 'SNAP=/snap/subiquity/3698', '--', '/snap/subiquity/3698/usr/bin/python3.8', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2391.4"}}', 'system-install', '-t', '/target', '--', 'zsh']' returned non-zero exit status 100.

Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15638]: E: Unable to locate package zsh
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: TIMED subp(['udevadm', 'settle']): 0.017
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/sys'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/sys'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/run'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server systemd[1]: target-sys.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/run'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/proc'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server systemd[1]: target-run.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/proc'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['mount', '--make-private', '/target/dev'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server systemd[1]: target-proc.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Running command ['umount', '/target/dev'] with allowed return codes [0] (capture=False)
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: system install failed for ['zsh']: Unexpected error while running command.
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Command: ['unshare', '--fork', '--pid', '--', 'chroot', '/target', 'eatmydata', 'apt-get', '--quiet', '--assume-yes', '--option=Dpkg::options::=--force-unsafe-io', '--option=Dpkg::Options::=--force-confold', 'install', 'zsh']
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Exit code: 100
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Reason: -
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Stdout: ''
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: Stderr: ''
Feb 15 16:18:46 ubuntu-server subiquity_log.2391[15627]: finish: cmd-system-install: FAIL: curtin command system-install
Feb 15 16:18:46 ubuntu-server curtin_event.2391.4[15627]: finish: cmd-system-install: FAIL: curtin command system-install
Feb 15 16:18:46 ubuntu-server systemd[1]: target-dev.mount: Succeeded.
Feb 15 16:18:46 ubuntu-server systemd[1]: run-u43.service: Main process exited, code=exited, status=100/n/a
Feb 15 16:18:46 ubuntu-server systemd[1]: run-u43.service: Failed with result 'exit-code'.
Feb 15 16:18:46 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall/install_zsh: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.2391', '--setenv', 'PATH=/snap/subiquity/3698/bin:/snap/subiquity/3698/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/3698/bin', '--setenv', 'PYTHONPATH=:/snap/subiquity/3698/lib/python3.8/site-packages', '--setenv', 'PYTHON=/snap/subiquity/3698/usr/bin/python3.8', '--setenv', 'SNAP=/snap/subiquity/3698', '--', '/snap/subiquity/3698/usr/bin/python3.8', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2391.4"}}', 'system-install', '-t', '/target', '--', 'zsh']' returned non-zero exit status 100.
Feb 15 16:18:46 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install/postinstall: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.2391', '--setenv', 'PATH=/snap/subiquity/3698/bin:/snap/subiquity/3698/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/3698/bin', '--setenv', 'PYTHONPATH=:/snap/subiquity/3698/lib/python3.8/site-packages', '--setenv', 'PYTHON=/snap/subiquity/3698/usr/bin/python3.8', '--setenv', 'SNAP=/snap/subiquity/3698', '--', '/snap/subiquity/3698/usr/bin/python3.8', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2391.4"}}', 'system-install', '-t', '/target', '--', 'zsh']' returned non-zero exit status 100.
Feb 15 16:18:46 ubuntu-server subiquity_event.2391[2391]: subiquity/Install/install: Command '['systemd-run', '--wait', '--same-dir', '--property', 'SyslogIdentifier=subiquity_log.2391', '--setenv', 'PATH=/snap/subiquity/3698/bin:/snap/subiquity/3698/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/3698/bin', '--setenv', 'PYTHONPATH=:/snap/subiquity/3698/lib/python3.8/site-packages', '--setenv', 'PYTHON=/snap/subiquity/3698/usr/bin/python3.8', '--setenv', 'SNAP=/snap/subiquity/3698', '--', '/snap/subiquity/3698/usr/bin/python3.8', '-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity": {"type": "journald", "identifier": "curtin_event.2391.4"}}', 'system-install', '-t', '/target', '--', 'zsh']' returned non-zero exit status 100.

`