Up till last week - updates were hapening as they should, then it stopped working ang all i get is the following error message

Can anyone advise please ?


"Could not initialise the package information

An unresolvable problem occurred while initialising the package information.

Please report this bug for the 'update-manager' package and try to include the following error message:

'E:Type ‘ain’ is not known on line 3 in source list /etc/apt/sources.list.d/aheck-ppa-precise.list' "