Suspend failed once and forever?

Question

I accidentally closed the lid and the system went to suspend (Ubuntu 14.04) but it seemed to last forever. So I forced quit the suspend. After I restarted Ubuntu and tried to let it suspend, it failed to do so complaining about a system error.

I searched online and found "acpi" issues and known bugs for Ubuntu but don't know whether this is related to my problem.

Answer 1

I don't know why, but when I issued:

sudo apt-get remove unity-lens-shopping

and then as APT suggested, ran:

sudo apt-get autoremove

after a system restart, the issue was resolved.

Maybe somebody can explain to me why.