I solved reinstalling. Precise steps: remove and purge:
#sudo apt-get --purge remove compiz-core restart system, reinstall compiz, restart. everything works again -- Compiz-fusion fails to start on ubuntu-studio because of XDG_CONFIG_DIR - /usr/bin/compiz: 376: /usr/local/bin/compiz: not found https://bugs.launchpad.net/bugs/141621 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs