Felix,
(With apologies to T-U readers as this has become somewhat O/T but
I hope it is still useful.)
The linux-image install may be failing as a result of a config
file left over from a removed but not purged package or an
obsolete config file resulting from a downgrade or failed upgrade.
Try the following (all on one line):
dpkg-query --show --showformat='${STATUS} ${PACKAGE} ${VERSION}
${ARCHITECTURE}\n' | grep 'deinstall ok config-files' | awk '{print
$4}'
That should give you a list of packages to be purged. If it
looks OK add a "dpkg --purge $(" on the front and a ")" on the
end to purge them.
Then try the reinstall again. If it works great. If it fails
please show me the result of:
grep 'obsolete$' /var/lib/dpkg/status
--Mike