If you are really convinced and believe there's something wrong with your Compaq then check your hard drive because you get crazy things showing up all of the sudden. Maybe that one is dying and needs to be replaced soon. Because it reminds me of my Packard Bell laptop i had a few years ago when i got the weirdest things happening on that machine. After someone showed me how to check the hard drive i knew enough, a lot of bad blocks and a few days later it died.
Another point of view:
Looking at your previous comments it's possible you're not running LMDE on the desktop since the update manager doesn't show you UP6 AND you posted a line containing a maya repo. Could it be you run Maya and mixed them up, thinking you run LMDE? Or you added a maya repo on LMDE which is never a good thing...? Or did you multiboot your compaq with other Mint versions and shared the same folders across that various versions? This is also never a good thing to do from my point of view.