I couldn’t boot into the linux519 after the update. I did some workaround in chroot but still not working, and the current erorr shows below, after this, it will just show black screen with a “_”. What can I do next?
Those errors look rather like Snap mount errors. They may hide the real issue.
Then what errors are of interest for solving problem?
output of sudo update-grub in chroot are a lot of
cannot create directory '/var/lib/os-prober/mount': no such file or directory
Read the guides linked above to find out.
seriously?
those failed mount are from snap, and probably not the reason why you cant boot…
are you using nvidia?
in the stuck screen, can you enter into tty?: press ctrl+alt+f2 or f1-f6 keys, enter your username/password and reinstall this:
for this try reinstalling os-prober:
sudo pacman -S os-prober
then run this:
sudo mkinitcpio -P && sudo update-grub
reboot:
systemctl reboot
no I can do nothing there…
so you have to chroot and do the commands from above there