i have an error at the end of shutdown, but i can't read it because it's just before the computer switches off. I can read something like "...error...ext4...". I don't know where i can find the error with journalctl. I tried journalctl --all, journalctl _SYSTEMD_UNIT=udisks2.service, journalctl _SYSTEMD_UNIT=systemd-shutdownd.socket, but there is nothing about this error.
Either try systemctl halt and make a note of the error shown, or follow these instructions.
Thank you, it was a good idea. But the problem is weird. The message is : EXT4-fs(sda3): ext4_da_writepages: jbd2_start: 8192 pages, ino 663752; err -30.
On google i saw it can be a hardware problem, and the sata port has to be changed, but i never opened a laptop...
I booted on debian and fsck sda3 (/), i had 2 problems : last mount and write are in the future, it was corrected, and no other problem. Then i boot arch and halt and i see something like : can't unmout / OK. Then i switch off, boot again, halt again, and the first message comes back : EXT4-fs(sda3): ext4_da_writepages: jbd2_start: 8192 pages, ino 663752; err -30.
Well, i don't know...