Revelation is a password manager for the GNOME desktop, released under the GNU GPL license. I was trying to install it on my workstation but apparently the package, which is available on Ubuntu 18.04 and Ubuntu 21.04 onward, it's not available on 20.04.
The alternative is getting the Ubuntu 21.04 version working on 20.04.
First install the required dependencies.
$ sudo apt install python3-pycryptodome python3-pwquality python3-cracklib
Then get the
.deb file from the Ubuntu repositories.
$ cd /tmp && wget http://archive.ubuntu.com/ubuntu/pool/universe/r/revelation/revelation_0.5.4-3_amd64.deb
And install it.
$ sudo dpkg -i revelation_0.5.4-3_amd64.deb
And you're done!
P.S. You can also build it from source. The instructions are here.