After a recent major update on Arch Linux which included a new kernel my system became unbootable. It is yet another lesson to be careful with Arch Linux. Thankfully regardless of how serious the issue seemed it can be solved with relative ease. You will need to boot Arch Linux from USB or CD and enter Chroot environment in Arch Linux to fix the issue.
The updating to the latest packages available on from
28th January 2015 caused the issue that made the system unbootable. The kernel
3.18.4-1 along with many other updates were available.
sudo pacman -Syu
After rebooting the system the system would no longer boot and displayed an error message.
ERROR: Unable to find root device 'UUID: de305d54-75b4-431b-adb2-eb6b9e546013'. You are being dropped into recovery shell. Type 'exit' to try and continue booting sh: can't access tty: job control turned off [rootfs /]#
Worst thing is that the keyboard while working during BIOS splash screen, stopped responding after the error message was displayed making any direct recovery impossible.
Issue seems to be with corruption or removal of certain packages. Re-installing the troublesome packages is probably the easiest option. To do that first boot Arch Linux from USB or CD and enter Chroot environment in Arch Linux. Once in chroot environment any commands executed are applied to the underlying installation.
Refresh all pacman repositories and upgrade.
Re-install udev package.
pacman -S udev
Re-install mkinitcpio package.
pacman -S mkinitcpio
Regenerate the default Linux image.
mkinitcpio -p linux
Reboot the system and remove the install medium.
If the issue was fixed your system should now boot normally as it did before the upgrade. Note that many of the steps may not be required but since there may be multiple issues it is simply less tedious to run all commands as opposed to running them one by one and then rebooting after each command.
Boot Arch Linux from USB or CD.
pacman -Syyu pacman -S udev pacman -S mkinitcpio mkinitcpio -p linux exit reboot