The version of TortoiseHg in Ubuntu can get quite outdated with time. Thankfully, installing and being updated with the latest version of TortoiseHg is pretty easy:
$ sudo add-apt-repository ppa:tortoisehg-ppa/releases $ sudo apt-get update $ sudo apt-get install tortoisehg
If apt complains that it needs a newer version of Mercurial for this installation, then install the latest Mercurial.
Tried with: TortoiseHg 2.10.2, Mercurial 2.8.2 and Ubuntu 12.04