I have been using
systemd for about a month without any problems on my Debian Jessie. I installed it according to the Debian wiki. But all of a sudden today I got this error:
How can I fix this?
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The lack of
systemd is the point where the system gave up because there was no more way to recover. When you see a series of errors, you need to go backward until you hit the root cause.
The lack of
systemd was due to an inability to mount the root filesystem.
mount: mounting … on /root failed: invalid argument
This inability to mount was due to the block device containing the root filesystem (which here is identified by a UUID) not being available.
It is highly likely that the block device in question is a partition on the disk concerned by the error messages immediately above. A series of messages like
end_request: I/O error, dev sdc, …
is a bad sign about the disk that is identified as
/dev/sdc. The CPU detects that a disk drive is present isn't able to read data from the drive. The cable or the drive is failing (or, a lot less likely because you'd have noticed before, the driver is buggy).