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How to rescue a 'broken' Linux PC from the command line

If a bad update killed your desktop interface, don't panic. You can still trigger a Timeshift restoration from the TTY ...
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How to Open a PDF File From the Command Line in Ubuntu

Ubuntu's Gnome-based graphical user interface lets you open and view business documents saved in the PDF format using the Nautilus file manager and a few mouse clicks. Since Ubuntu is a Linux ...