Synaptic Package Manager not responding

[Luca_Pavan]

I opened Software and Updates (software-properties-gtk) from Synaptic Package Manager and when I closed it Synaptic Package Manager kept stucked that way , everything grayed, and placing the cursor on the window shows the loading animation but even after leaving it opened for over 1 hour it never unblocked itself.

When I checked its memory usage I saw it was consuming very few, usually when a software stops responding is using a growing amount of memory or has reached the maximum available, till I have to force-close or the system asks me if wait or terminate. I couldn't close it normally, doesn't work in this cases, it's not the first time that certain windows stop responding but usually it's temporary, not permanent.

I also tried to uninstall it and Software Center notified me

Impossible to remove <<Synaptic Package Manager>>:
E:Impossible to obtain the block /var/lib/dpkg/lock-frontend.
It's treatened by process 2114 (synaptic)

but probably it's normal as Synaptic Package Manager was still running after all.

[Winged1]

If you have not rebooted yet, use the following terminal command. sudo killall synaptic

This command will require a password.

[zabadabadoo]

Moved from Feedback to General Help.

I also had an issue with Synaptic PM yesterday. It failed to start, showing a dpkg error and proposing a fix. I tried uninstalling (to then reinstall) but it would not uninstall, even after a boot. I then entered the suggested terminal command fix for the dpkg error (to do with certificates) and then Synaptic PM opened OK. I have not tried to uninstall since, but was unusual behaviour from a trusted app.

[Aravisian]

The most recent Zorin Updates to come down the pipe included certificates and heimdal.

I think all users should run

sudo apt update && sudo apt upgrade

first thing.