Latest Ubuntu 12 user agents:

User Agent Browser Device
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Ubuntu/12.10 Chromium/22.0.1229.94 Chrome/22.0.1229.94 Safari/537.4 Chromium 22 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Ubuntu/12.04 Chromium/22.0.1229.79 Chrome/22.0.1229.79 Safari/537.4 Chromium 22 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.22 (KHTML, like Gecko) Ubuntu/12.04 Chromium/25.0.1364.172 Chrome/25.0.1364.172 Safari/537.22 Chromium 25 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.22 (KHTML, like Gecko) Ubuntu/12.04 Chromium/135.0.7049.20 Chrome/135.0.0.0 Safari/537.22 Chromium 135 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.17 (KHTML, like Gecko) Ubuntu/12.04 Chromium/24.0.1312.2 Chrome/24.0.1312.2 Safari/537.17 Chromium 24 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Ubuntu/12.10 Chromium/23.0.1271.64 Chrome/23.0.1271.64 Safari/537.11 Chromium 23 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Ubuntu/12.04 Chromium/23.0.1271.64 Chrome/23.0.1271.64 Safari/537.11 Chromium 23 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.1 (KHTML, like Gecko) Ubuntu/12.04 Chromium/21.0.1180.79 Chrome/21.0.1180.79 Safari/537.1 Chromium 21 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.11 (KHTML, like Gecko) Ubuntu/12.04 Chromium/20.0.1132.47 Chrome/20.0.1132.47 Safari/536.11 AlexaToolbar/alxg-3.1 Chromium 20 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.11 (KHTML, like Gecko) Ubuntu/12.04 Chromium/20.0.1132.47 Chrome/20.0.1132.47 Safari/536.11 Chromium 20 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 AlexaToolbar/alxg-3.1 Chromium 18 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Chromium 18 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Chromium 18 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.6 (KHTML, like Gecko) Chromium/17.0.963.56 Chrome/17.0.963.56 Safari/537.6 Ubuntu/12.10 (3.6.1-0ubuntu1) Epiphany/3.6.1 GNOME Web 3 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.4 (KHTML, like Gecko) Ubuntu/12.10 Chromium/22.0.1229.94 Chrome/22.0.1229.94 Safari/537.4 Chromium 22 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.4 (KHTML, like Gecko) Ubuntu/12.10 Chromium/22.0.1229.94 Chrome/22.0.1229.94 Safari/27F0A Chromium 22 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu/12.10 Chromium/27.0.1453.6 Chrome/27.0.1453.6 Safari/537.36 Chromium 27 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.33 (KHTML, like Gecko) Ubuntu/12.10 Chromium/27.0.1438.7 Chrome/27.0.1438.7 Safari/537.33 Chromium 27 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.19 (KHTML, like Gecko) Ubuntu/12.10 Chromium/25.0.1323.1 Chrome/25.0.1323.1 Safari/537.19 Chromium 25 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.11 (KHTML, like Gecko) Ubuntu/12.10 Chromium/23.0.1271.64 Chrome/23.0.1271.64 Safari/537.11 Chromium 23 Unknown