Latest Ubuntu 18 user agents:

User Agent Browser Device
Mozilla/5.0 (X11; Ubuntu 18.04; Linux x86_64; rv:84.0) Gecko/20100101 Firefox/84.0 Firefox 84 Unknown
Mozilla/5.0 (X11; Ubuntu 18.04; Linux x86_64; rv:144.0) Gecko/20100101 Firefox/144.0 Firefox 144 Unknown
Mozilla/5.0 (X11; Ubuntu 18.04; Linux x86_64; rv:108.0) Gecko/20100101 Firefox/108.0 Firefox 108 Unknown
Mozilla/5.0 (X11; Ubuntu 18.04 LTS; Linux x86_64; rv:93.0) Gecko/20100101 Firefox/93.0 Firefox 93 Unknown
Mozilla/5.0 (X11; Ubuntu 18.04 LTS; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 Chrome 93 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu/18.04.4 Chrome/120.0.6099.109 Safari/537.36 uacq Chrome 120 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu/18.04 Chrome/90.0.0.0 Safari/537.36 Chrome 90 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.11 (KHTML, like Gecko) Ubuntu/18.04 Chrome 68.0.3409.2 Safari/537.36 Chrome Unknown
Mozilla/5.0 (Ubuntu 18.04 LTS; rv:145) Gecko/20100101 Firefox/145 Firefox 145 Unknown
Mozilla/5.0 (Linux; Ubuntu 18.04) AppleWebKit/537.36 Chrome/83.0.4103.122 Safari/537.36 Chrome 83 Unknown