Since that version of Ubuntu stopped being support on 2021, you'd need to use the tar file. Back up your Unbound config files first as a precaution. This response is a little simple, but should point you in a direction.
Steven ------- Original Message ------- On Wednesday, September 21st, 2022 at 05:42, JAHANZAIB SYED via Unbound-users <unbound-users@lists.nlnetlabs.nl> wrote: > OS: Ubuntu - 16.04.3 LTS (Xenial Xerus) > Unbound Default apt Installed verion: Version 1.5.8 > > How can I upgrade (keeping current configuration) to Latest stable release ? > > Regards, > SJZ > http:///