Most Mint Rebecca 7.1 Administration applications will not open
Linux Mint 17.1 Rebecca: Intel i7 computer with plenty of resources.
Software Manager, Software Sources, Update Manager, Backup Tool will not open. When the icon is clicked on, each app asks for a PW then nothing opens. The Update Manager does not appear with its usual Icon. It looks blank.
I am able to do administration from the command line like:
sudo apt-get update I then enter my PW.... all is ok.
The Terminal return from ~$ aptitude search mintupdate is
I mintupdate - The Linux Mint Update Manager
I don't know what this means put I hope it is helpful.
Is there a Terminal command which I can enter to get these Mint Administration applications working as they usually did from the Menu.
Everything else seem to be working fine
I have been using Linux 10 months and up to now I have had no problems. I like Linux.
Any help will be most appreciated. Suggestion please.