Last time I tested trusty tahr XFCE was not behaving correct. They released it a day ago, and I upgraded few of my machines at home. Everything worked great. As far as desktop, for me there weren’t that much changes. XFCE still works.
The set back I noticed was not due to ubuntu but due to the incompatibility of the bitcoin client. The bitcoin-qt program depends on libdb4.8 and boost 3.1, which are not part of ubuntu anymore (and most likely debian). So it seems that the ubuntu maintainers removed it from the distribution for that purpose. People on the forum were reasoning that the PPA maintainer doesn’t have time and he’s only one guy. I don’t think the guy can do anything if the dependencies are not there, I also don’t think that ubuntu distribution will accept a statically linked version of bitcoin-qt.
May be bitcoin should move the standard wallet to another format, which is not dependent on a certain libdb version. May be an XML format with the wallet encoded as hex strings.
Your work around: Download the statically linked version from the bitcoin.org website.