sched-error-20 – If you see this boot error that appears with hundreds of lines, do not panic the help is near.
** 19 printk messages dropped **
(200.119021) nouveau <missing> fifo: schedule error 20 (<missing>)
The problem is solved by following this guide below
1: Open the terminal and copy this command sudo nano / etc / default / grub-and enter the terminal, enter your password and enter enter.
2: Navigate to this line using the arrow keys
3: GRUB_CMDLINE_LINUX_DEFAULT = “quiet splash”
4: Change it so it looks like this
GRUB_CMDLINE_LINUX_DEFAULT = “quiet splash nouveau.modeset = 0”
5: Press Ctrl + X, followed by Y, and press ENTER to save the changes
6: Now copy this command sudo update-grub-and insert into the terminal and enter enter
7: Restart the computer and everything works fine.