I just updated my watching only Windows Armory wallet to 92.3 as suggested, only to find that my 88.1 wallet on Ubuntu I use for signing is no longer compatible. Would not have upgraded if I had been aware of the problem.
How do I upgrate the wallet on Ubuntu 12.04 easiest way please to 92.3?
1) Make sure you have backups of the wallets on your offline machine
2) Download the .deb for your version and install it on top of the previous version. Probably something like: sudo dpkg -i ./*packagename*.deb
3) Run Armory.
The installer only replaces the binaries, it doesn't touch your user folder (meaning all wallets and settings will carry over). Technically you could even skip step 1), but it is a general precaution to have backups of your wallets, so if you don't have any, do it!