It will depend on whether you have installed for the distributions repositories using their software manager or whether you have installed a flatpak version either from the repository or the GnuCash website.
The flatpak versions often require specific permissions granted so they can access the computer's peripherals as they are a protected sandbox setup. If you search the mailing list archives you will find more info on how to do this. If it is a flatpak version this may be the problem rather than GnuCash itself although I would still expect the database options to appear in the File -Save As dialogue but fail on the attempt to write to the database. That may indicate that it has been built without the basic libdbi support. The libddi-mysql library is a run time library (similar libraries for PostGRES and SQlite3) which has to be present at runtime. You can check that the libraries are loaded using the command "dpkg -l |grep libdb" in a terminal which should list all the related installed packages. My Linux MInt 20.3 system has all three libdbd-mysql, libdbd-pgsql and libdbd-sqlite3 installed as well as the libdbi library (I also have the development header file libdbi-dev as I build GnuCash from the tarball on the website). If you can let us know which Linux distribution and version number and the GnuCash version which is installed and how you installed it (software Manager, apt, or other) we may be able to give more specific advice. Usually the versions maintained by the distribution repositories are built with all the normal default build options which should include the database backends. Building from scratch is a possibility if all else fails. See https://wiki.gnucash.org/wiki/Building_On_Linux for detailed instructions David Cousens ----- David Cousens -- Sent from: http://gnucash.1415818.n4.nabble.com/GnuCash-User-f1415819.html _______________________________________________ gnucash-user mailing list gnucash-user@gnucash.org To update your subscription preferences or to unsubscribe: https://lists.gnucash.org/mailman/listinfo/gnucash-user If you are using Nabble or Gmane, please see https://wiki.gnucash.org/wiki/Mailing_Lists for more information. ----- Please remember to CC this list on all your replies. You can do this by using Reply-To-List or Reply-All.