Hi,
I have tried to install Unvanquished on Ubuntu Trusty Thar via the repository but it seems that file "unvanquished-archive-key.gpg.asc" is no longer present.
"unvanquished-archive-key.gpg.asc" 404 Not found :
And this file is not listed in the directory :
I will tried to download Unvanquished by the torrent file.
But can you reupload the GPG key ?