I installed Ubuntu Touch on my Nexus 10 back in November 2014. As far as I remember, I got an over-the-air update at some point. I have been away a lot and have only just come back to my Nexus 10, now to find that:
1) there is no system update available, which seems very strange considering all the work that has been done since the Ubuntu phones started being released (I have a EQ 4.5 and have regularly been reviving updates for it!), and
2) app updates don't "stick" - i.e., app updates are shown to download and install but when I tap out of the updates screen, and then back into the updates screen, all updates are shown as requiring to be installed again!
Tech specs: - OS: Ubuntu 15.04 (r2)
Output of system-image-cli -i:
current build number: 2 channel: devel alias: ubuntu-touch/vivid last update: 2016-10-24 02:48:14 version version: 2 version ubuntu: 20150413 version device: 20150210 version custom: 20150413