Comment 11 for bug 286172

I looked at my /var/spool/cron:

ls -l /var/spool/cron
total 3
drwxrwx--T 2 bin bin 1024 2007-06-21 10:10 atjobs
drwxrwx--T 2 daemon daemon 1024 2008-07-10 11:01 atspool
drwx-wx--T 2 root crontab 1024 2008-10-17 23:28 crontabs

Notice that atjobs has owner as bin/bin. I changed this to daemon:daemon:

sudo chown daemon:daemon /var/spool/cron/atjobs

Then I was able to configure at, ubuntu-standard and lsb-core.

I don't know what changed the permissions, but they may be the same as an old bug reported:

https://bugs.launchpad.net/ubuntu/+source/apt/+bug/279395

Now things seem to be working!