irc-eu-1% sudo apt install libmariadb3
Reading package lists... Done
Building dependency tree
Reading state information... Done
libmariadb3 is already the newest version (1:10.3.22-0+deb10u1).
libmariadb3 set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
irc-eu-1% sudo apt install /tmp/inspircd.deb
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'inspircd' instead of '/tmp/inspircd.deb'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 inspircd : Depends: libmariadbclient18 (>= 10.1.38-0+deb9u1) but it is not installable
E: Unable to correct problems, you have held broken packages.