I bet u saw with error message window “System problem detected” in Ubuntu. This issue comes from existance of files in /var/crash folder. Inspecting those files could help you to validate the errors in applications and check what's wrong with it.

The task was to migrate an old image field to media.

Information about journals in Linux and how to control their size.

Found the bug in Geany editor with underscores - they were invisible. Default font is Monospace.
Here is a solution how to fix it.

This article will help you to create a bootable usb flash from iso in Linux without 3rd party program.