On the website they have mentioned to user ppa
For Ubuntu and derivaties, @deepsidhu1313 provides a PPA with our latest release here:
https://launchpad.net/~linuxgndu/+archive/ubuntu/sqlitebrowser
I added these two lines
deb http://ppa.launchpad.net/linuxgndu/sqlitebrowser/ubuntu trusty main
deb-src http://ppa.launchpad.net/linuxgndu/sqlitebrowser/ubuntu trusty main
to software & update > other software > add > paster the two lines one by one and added both separately
I ran sudo apt-get update
but I get error saying public key didn't match
The ppa at launchpad has mentioned signing key & fingerprint but I am not sure where to add which one of them to pass the error.