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Upgrading to the latest lts kernel (4.14.49) breaks my system. After the update, I can't mount FAT nor exFAT partitions anymore (unknown filesystem type error) and my system won't init because it will fail when mounting my /boot partition.
If someone has the same error, I solve it using a live usb to went back to the 4.14.40 kernel version and ignoring linux-lts and linux-lts-headers packages in pacman.conf
I though switching to the lts kernel was going to prevent my system from breaking down when updating it, but I was wrong.
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That usually happens when you update when your boot partition isn't mounted, or when your bootloader isn't looking at your boot partition.
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Moving to NC...
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