Yes, sqlite, sqlite3, as well as lsqlite3 are all installed on my system.
phpBB was working fine on the old host. As I had mentioned, I was unable to prepare phpBB for moving to a new host prior to losing access. Therefore, all I had was a tar.gz file of my entire webdoc (/var/www/html/[sites]), as well as my /etc/apache2 directories. I also had a tar.gz of the directory where the forum database was stored.
All of the users and groups are the same on the new host. Both hosts had the same OS (Ubuntu 20.04). All tar.gz files were created by the root user, and installed by root on the new system. All file ownership and permissions seem fine.
So I guess my main question would be -- can I install a fresh copy of phpBB over the existing installation, then just point to the data file?
It's not that the existing installation is large, only recently created, but replicating the structure, and use accounts would be very time consuming, and open to many errors on my part.