Synaptic Package Manager

[geaves]

Here, in Terminal:

Code:

sudo aptitude reinstall apt apt-utils aptdaemon aptdaemon-data update-manager update-manager-core dbus

And reboot your computer... let us know

Output;

update-manager is not currently installed, so it will not be reinstalled.
update-manager is not currently installed, so it will not be reinstalled.
The following packages will be REINSTALLED:
  apt apt-utils aptdaemon aptdaemon-data dbus update-manager-core
0 packages upgraded, 0 newly installed, 6 reinstalled, 0 to remove and 2 not upgraded.
Need to get 1,385 kB of archives. After unpacking 0 B will be used.
E: Can't find a source to download version '1.1.1+bzr982-0ubuntu14' of 'aptdaemon:amd64'
E: Can't find a source to download version '1.1.1+bzr982-0ubuntu14' of 'aptdaemon:amd64'
E: Internal error: couldn't generate list of packages to download