Post Ubuntu upgrade: hip-chat not starting (fix)

I have just updated my Ubuntu installation to the latest distribution (15.04) and found out that hip-chat was no longer starting. I went to the terminal to launch it via the command line and had the following error.
%> hipchat
/usr/bin/hipchat: /opt/HipChat/bin/..//lib/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by /usr/lib/x86_64-linux-gnu/libicuuc.so.52)

Simpy reinstalling fixed my issue. So first I removed it.
%> sudo apt-get remove hipchat

To reinstall though, I had to re-enable the external dependency commented out by the Ubuntu upgrade procedure.
%> sudo vim /etc/apt/sources.list.d/atlassian-hipchat.list

Remove the starting “#” to re-enable the line. Then run
%> sudo apt-get update
%> sudo apt-get install hipchat

That fixed the problem for me.