Thanks Tom, i tried but as per googling i found we cant revert back automatically to older version. Only solution is to uninstall the current version and manually install old version from source.
sudo apt-get install firefox=55.0.2+build1-0ubuntu0.16.04.1 Reading package lists... Done Building dependency tree Reading state information... Done E: Version '55.0.2+build1-0ubuntu0.16.04.1' for 'firefox' was not found -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1720908 Title: Firefox cannot load Flash because of libxul broken dependency To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1720908/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
