upgrade authenticating packages error

[Ana Oprea]

While upgrading backtrack to kubuntu 12.04, I got error authenticating packages:
ash
dhcpcd
mktemp
sreadahead

root@bt:~/Desktop# lsb_release -rd
Description: Ubuntu 10.04.3 LTS
Release: 10.04

root@bt:~/Desktop# apt-cache policy update-manager
update-manager:
  Installed: (none)
  Candidate: 1:0.156.14.11
  Version table:
     1:0.156.14.11 0
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main Packages
     1:0.156.14.5 0
        500 http://security.ubuntu.com/ubuntu/ precise-security/main Packages
     1:0.156.14 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main Packages
     1:0.134.11 0
        500 http://all.repository.backtrack-linux.org/ revolution/main Packages
     1:0.134.7 0
        500 http://all.repository.backtrack-linux.org/ revolution/main Packages