Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
  fglrx
The following NEW packages will be installed:
  fglrx
0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded.
2 not fully installed or removed.
Need to get 0 B/80,6 MB of archives.
After this operation, 245 MB of additional disk space will be used.
Do you want to continue [Y/n]?
WARNING: The following packages cannot be authenticated!
  fglrx
Install these packages without verification [y/N]? y
(Reading database ... 293714 files and directories currently installed.)
Unpacking fglrx (from .../fglrx_2%3a9.010-0ubuntu3_amd64.deb) ...
One or more files have been altered since installation.
Uninstall will not be completed. See /etc/ati/fglrx-uninstall.log for details.
dpkg: error processing /var/cache/apt/archives/fglrx_2%3a9.010-0ubuntu3_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/fglrx_2%3a9.010-0ubuntu3_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)