Comment 31 for bug 1964916

I installed Ubuntu 22.04.2 LTS (Jammy Jellyfish) with Legacy safe graphics mode.

 After installation open terminal
and do the following (able to do despite the flikering):

Sudo nano /etc/defaul/grub

add nomodeset to GRUB_CMDLINE_LINUX_DEFAULT:

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
GRUB_CMDLINE_LINUX=""

Then save by hitting Ctrl+O enter, exit nano whit Ctrl+X

Then run:

sudo update-grub

sudo reboot. (Rebooting doesn't work. Needs to shut down and restart?)

Now lines do not appear but the screen is large

Next still whit terminal.
xrandr_____ to see which Display is in use. (My was default)

$cvt 1600 900 (At this point there were several bug reports, I didn't care)

$cvt 1600 900
# 1600x900 59.95 Hz (CVT 1.44M9) hsync: 55.99 kHz; pclk: 118.25 MHz
Modeline "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync

$xrandr --newmode "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync

$xrandr --addmode default "1600x900_60.00"

$ xgamma
-> Red 1.000, Green 1.000, Blue 1.000 (For some strange reason this had to be done, otherwise it didn't work)

then

$sudo nano /etc/default/grub

find the line exsample:

#GRUB_GFXMODE=1024x768 (maybe something else)

edit 1024x786 to your resolution: 1600x900, remove the #

example:

GRUB_GFXMODE=1600x900

update by the command

$sudo update-grub

Then reboot your computer

$sudo reboot

This is what I done whit my HP Omni 120-1100eo Desktop PC