I'm having LOTS of problems trying to install Ubuntu on an external USB hard drive.
My problem now is that, while installing (just after entering my login info) the Installation got stuck saying "Detecting file systems" and the console says:

** (firefox:17720): WARNING **: Failed to open webapp application path dir /usr/local/share/unity-webapps/userscripts: Error opening directory ' /usr/local/share/unity-webapps/userscripts' : No such file or directory
And said the same like 6 times but with different directories.

I don't know what to do, I thought it was doing fine (after 2 days of hard work trying to install this...)