Software update not working
I am running zotero 4.0.22 on ubuntu 14.04. I installed it from the zotero website, not from any repo. Zotero constantly tells me that an update is available, but when I say to install it, it says "Connecting to the update server..." and then nothing happens.
https://www.zotero.org/support/debug_output
If you need to update, just re-installing does the same thing, btw., your data is stored somewhere else and so wouldn't be affected by that.