Just like the title says. lots of people seem to get this error, so I'm sure your know which one I'm referring to, but i've found only one instance where someone gets it everytime they try to go to the admin dashboard, and it doesnt seem to have been solved so I wondered if anything was ever found about it.
One note. I had a bunch of issues before, I attempted to set it up without updating ubuntu, it worked on one machine. I tried it on 3 other machines, now all 3 of the new ones give this error. I tried updating one of them and it still does it, so I have 1 non-updated machine working 2 non updated not working and 1 updated not working.
Hope that is clear enough since I think it sounds a little convoluted.