Stéphane Charette

Thanks, @Stan`, that helped me solve it. In case anyone else runs into this: Most of the errors were cause by a folder called ~/.local/share/0ad/mods/techtree. I found if I completely deleted the folder called ~/.local/share/0ad/mods then it was rebuilt when the game would start up again, and this time with zero javascript errors.

Oh, you mean in the old version before I upgraded? Yes, I think I did. Is there a way to disable them?

How do I tell if I have mods? I ran this command to install it: sudo apt-get install 0ad

I upgraded my desktop to Ubuntu 20.04. Which upgraded 0ad. But now it wont run. Instead, it logs this error many times per second: ERROR: JavaScript error: Errors executing script event "Tick" ERROR: JavaScript error: __internal(0) Tick line 0 ReferenceError: onTick is not defined __eventhandler0 (Tick)@__internal(0) Tick:0:1 ERROR: JavaScript error: Errors executing script event "Tick" ERROR: JavaScript error: __internal(0) Tick line 0 ReferenceError: onTick is not defined __eventhandler0 (Tick)@__internal(0) Tick:0:1 I cannot seem to find any references to this error, so could use some help. This is the version I have installed: > dpkg -l | grep 0ad ii 0ad 0.0.24~r23742-0ubuntu1~20.04~wfg0 amd64 Real-time strategy game of ancient warfare ii 0ad-data 0.0.24~r23742-0ubuntu1~20.04~wfg0 all Real-time strategy game of ancient warfare (data files) ii 0ad-data-common 0.0.24~r23742-0ubuntu1~20.04~wfg0 all Real-time strategy game of ancient warfare (common data files)