I'm having an issue with one of my Linux Mint machines, where the client is disconnected when I open BOINC Manager.

I ran these 2 commands and rebooted, as for some it was a permissions issue:
sudo chmod -R g+rwx /etc/boinc-client
sudo chmod -R g+rwx /var/lib/boinc-client

I have checked TOP in a terminal window, and can see 1 Setiathome task running using about 17% CPU, which could be normal at the moment, since it may have not reached out to get new tasks since the servers came back online, or has stuck download tasks.

Any other ideas?

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~Chris

Could be many things. Firewall blocking port 31416. Missing dependency on the Manager. gui_rpc_auth.cfg file missing or corrupted. Can you just open a Terminal in the BOINC apps directory and issue a manual start of the Manager. Or start the Manager via the boinccmd app. Or reissue a sudo systemctl boinc-client restart.

./boincmgr

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Seti@Home classic workunits:20,676 CPU time:74,226 hours

A proud member of the OFA (Old Farts Association)

I too started having issues last week and just now started looking into it - when launching BOINC from terminal I get this error - I am running the special app - If your running the standard flavor you can remove and reinstall
sudo apt remove boinc-client boinc-manager THEN sudo apt install boinc-client boinc-manager

My launch from terminal showed this error
Failed to load module "canberra-gtk-module" (I then reinstalled it)

I also assume some modules were removed at some point due to other software I installed in my system because I also had to reinstall the following as well:
sudo apt-get install libcurl3
sudo apt-get install ocl-icd-libopencl1