Synaptic Package Manager error - Linux Mint 13 Mate

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http://www.linuxquestions.org – Newbie question here. Sorry if I've missed this exact problem in the forum - I tried to search but couldn't find it. Anyway, after a clean install of Mint 13 Mate on my old Thinkpad T42, I immediately ran into problems with Mintupdate and Synaptic package manager. After some search I was able to update my Mint installation by sudo apt-get update, sudo apt-get upgrade, and then I ran sudo apt dist-upgrade mintupdate. So far so good. When trying to launch Synaptic after this it refuses to start. I followed a some tips/hints found in a few forums around, but no avail. To summarize: running the (HowTos)