root@xxx:/var/lib/apt# ll
total 72
drwxr-xr-x 8 root root 4096 Mar 9 15:38 ./
drwxr-xr-x 44 root root 4096 Mar 4 14:03 ../
-rw-r--r-- 1 root root 233 Sep 14 2012 cdroms.list
-rw-r--r-- 1 root root 233 Sep 14 2012 cdroms.list~
-rw-r--r-- 1 root root 9311 Mar 9 15:38 extended_states
drwxr-xr-x 2 root root 4096 Sep 14 2012 keyrings/
drwxr-xr-x 3 root root 4096 Mar 9 15:51 lists/
drwxr-xr-x 3 root root 12288 Mar 9 15:17 lists.old/
drwxr-xr-x 3 root root 16384 Mar 9 15:36 lists.old2/
drwxr-xr-x 3 root root 4096 Mar 9 15:22 mirrors/
drwxr-xr-x 2 root root 4096 Apr 20 2012 periodic/
root@xxx:/var/lib/apt# mv lists lists.old3
root@xxx:/var/lib/apt# mkdir -p lists/partial
root@xxx:/var/lib/apt# apt-get update
Get:1 http://ppa.launchpad.net precise Release.gpg [316 B]
Get:2 http://de.archive.ubuntu.com precise Release.gpg [198 B]
Get:3 http://de.archive.ubuntu.com precise-updates Release.gpg [198 B]
Get:4 http://ppa.launchpad.net precise Release [12.9 kB]
Get:5 http://de.archive.ubuntu.com precise-security Release.gpg [49.6 kB]
Get:6 http://ppa.launchpad.net precise/main Sources [8,645 B]
Get:7 http://de.archive.ubuntu.com precise-backports Release.gpg [194 kB]
Get:8 http://de.archive.ubuntu.com precise Release [53.0 kB]
Get:9 http://ppa.launchpad.net precise/main i386 Packages [12.1 kB]
Get:10 http://ppa.launchpad.net precise/main TranslationIndex [202 B]
Get:11 http://de.archive.ubuntu.com precise-updates Release [53.1 kB]
Get:12 http://ppa.launchpad.net precise/main Translation-en [8,370 B]
Ign http://de.archive.ubuntu.com precise Release
Ign http://de.archive.ubuntu.com precise-updates Release
Get:13 http://de.archive.ubuntu.com precise-security Release [53.0 kB]
Ign http://de.archive.ubuntu.com precise-security Release
W: GPG error: http://de.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://de.archive.ubuntu.com precise-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
E: GPG error: http://de.archive.ubuntu.com precise-security Release: The following signatures were invalid: NODATA 1 NODATA 2