Hello
I am install Ubuntu Mate 20.04 on an old laptop computer. With the live-USB, everything is fine. But after the complete install, the display resolution is reduced to 640x480 and I can't change it, no other resolution is available.
I have read old posts about similar issues, but no clear solution.
Thanks to anybody who can help !
André
Back in 2014, when I used Linux Mint, I needed to add the 1920x1080 (1080P) resolution for a TV connected via a VGA cable. I wrote this article that details the step-by-step. Both cvt and xrandr are pre-installed, so these same steps will work on Ubuntu MATE. The two additional resources referenced at the bottom of the article might be able to help you out as well.
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Thank you very much for this answer.
I finally solved my problem by modifying the grub file
(line GRUB_GFXMODE=1280x800)
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