After fiddling around with different video editors in Ubuntu 11.04, I’ve settled on what I think is the most stable, and most useful software package: OpenShot
OpenShot is available through the Synaptic package manager, so it’s a fairly straightforward installation. You also might want to get the extra codecs package, “libavformat-extra-52″, if you want to export anything using the h.264 codec.
From a terminal window, you can install everything you need to use OpenShot by typing the following:
sudo apt-get install openshot libavformat-extra-52
OpenShot seems to work better with the native .MTS files that my Canon HF100 saves on its SDHC card than Pitivi. At least, it hasn’t crashed yet, and hasn’t failed to import any files from my camera.