From Guild Wars Wiki

Warning: Running Guild Wars on a non-Windows operating system, or with any other computer which does not meet the system requirements, is completely unsupported by ArenaNet and NCSoft.

[edit] Installing Wine on Ubuntu system

Use the following command to install Wine pre-compiled package on Debian system:

sudo apt-get install wine
<Enter your password>

Continue on Guild Wars on Wine to complete the GuildWars client installation.

Minimizing issues:

after you install Guild Wars, it doesn't let you minimize the window, or in other words it's like having your background as Guild Wars without your icons.

What you need to do before you start Guild Wars is:

1. right click on your panel - add to panel... - and add the show desktop item

2. after loading Guild Wars if you want to minimize it, hit the minimize button on Guild Wars, then your panel should appear

3. hit the show desktop button you added earlier, and now it's officially minimized

4. to get it back up all you have to do is hit alt-tab and find Guild Wars

[edit] Ubuntu notes

It is recommended that you update your package manager to use the official Wine repositories, if you can. Once you've done this, you can run the command above as usual to get the most recent version of Wine.