I was unable to start barrier after an update. The GUI would crash immediately. I tried running it in a terminal ( by running the command
barrier directly) and got the error:
▶ barrier Fontconfig warning: FcPattern object weight does not accept value [0 205)  8790 segmentation fault (core dumped) barrier
Some googling led me to this fix:
sudo rm /var/cache/fontconfig/* rm ~/.cache/fontconfig/* fc-cache -r
After those three commands, I was able to launch barrier without issue.