I'm getting linker/library errors. Can I run the downloader from source code?
Yes, a source version is available. This should help with errors such as "/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.14' not found". To run it from source, first install the required packages:
$ sudo apt-get install bzr python-virtualenv
Then branch the U1 downloader app from Launchpad:
$ bzr branch lp:~toykeeper/+junk/u1-downloader
Then follow the instructions in the readme.txt file inside that new source code branch.