Hi,
Did it just for me or others notice too that GW2 installer take high amount CPU (for me it ~99%). First try was on Unity DE, then all 4 CPU cores was used ~100%, all RAM and Swap was used too (newer been before). Next try was Ubuntu with Fluxbox (much lighter than Unity). Results was better (at least GW2 pretty installer window appears). However when I press "Install Guild Wars 2" big red button - nothing happens.. at that state Xorg CPU usage stay on ~100% GW2.exe ~50%.. since screen isn't changed I do not understand if it downloaded something or not. For now I'll abandon idea install this game..
Ubuntu 12.04 64bit, Nvidia 560GTX, 8GB ram.
Update
There already exist forum post about mentioned problem (don't know how delete this post).