> So I would like to "break in" the vm-template as dom0, and change
> that one line in /etc/pam.d/common-auth back. But how to mount the
> root.img file?
I answer my own question, since this is more easy & efficient than I
thought, and should help others in many cases!
(0) make sure template-vm is halted.
(1) as dom0 root:
(a) fdisk -l path-to-root.img
Then read off the start sector of ...root.img3, (say,
1000). Multiply that value with 512 (512000 in my example).
(b) mount -o loop,offset=512000 path-to-root.img /mnt
(change 512000 by your value)
(c) modify bad config files
(d) umount /mnt
(2) restart template-vm
and we're back! Bernhard
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