apt-cache policy udev
udev:
  Installed: 175-0ubuntu9.5
  Candidate: 175-0ubuntu9.5
  Version table:
 *** 175-0ubuntu9.5 0
        500 http://ch.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     175-0ubuntu9 0
        500 http://at.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages


# apt-get install udev
Reading package lists... Done
Building dependency tree
Reading state information... Done
udev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 238 not upgraded.
3 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
Setting up udev (175-0ubuntu9.5) ...