Is Ubuntu Chromium still safe to use since its so out of date?
While Chromium team ppas won't release new versions of Chromium browser, Alex Shkop will try to maintain more-or-less fresh releases of Chromium. Two PPAs were built for Chromium stable and Chromium development version. Install Latest Version of Chromium: For now, two PPAs only provide packages for Ubuntu 12.04.
To add Chromium Stable PPA (currently it's version 21):
To add Chromium Dev PPA (currently it's version 23):
After added a PPA, update your repository and install Chromium:
The version in the archive is current Chromium 18, that's three major stable releases behind Google Chrome, so yes, it is vulnerable for every issue Chrome has fixed in the past three releases.
Since Chromium is in universe it's really a manpower/best effort issue, whereas Firefox is in main and gets full security team support. Another option is to build/download your own Chromium or use Google Chrome, which is updated on Google's schedule. Personally I use Chrome.
Some other options: