Chromium not launching on Ubuntu 18.04

[BegTheo]

Hello ! I need some help for launching my ubuntu.
When i try to launch chromium on Ubuntu 18.04, i get the following error : Using PPAPI flash. /usr/lib/chromium-browser/chrome-sandbox: error while loading shared libraries: librt.so.1: cannot open shared object file: No such file or directory . But Chromium worked well before getting this error.
Please can anyone help me or know how to fix this error?

I'm beginner.

[Krinkle]

This error indicates that most likely a dependency was not installed with the package.
See here for a list of common packages that Chromium requires but are often not installed by default on Linux.

If you installed Chromium from an app store or simply from apt-get install chromium-browser, then you may also want to report this to your package manager as it would seem a dependency was forgotten to be installed.