root@vmhost:/var/log# apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  ppp x11-common
The following NEW packages will be installed:
  ppp
The following packages will be upgraded:
  x11-common
1 upgraded, 1 newly installed, 0 to remove and 1133 not upgraded.
411 not fully installed or removed.
Need to get 0 B/365 kB of archives.
After this operation, 780 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
WARNING: The following packages cannot be authenticated!
  x11-common ppp
Install these packages without verification? [y/N] y
(Reading database ... 248371 files and directories currently installed.)
Preparing to unpack .../x11-common_1%3a7.7+13ubuntu3_all.deb ...