If you're using the SQLite3 connector but don't have the sysvsem.so extension loaded, then you can not configure the front end and there are no error messages or indicators to tell you what you're missing.
- Enable only the SQLite3 database in your PHP config. Make sure the sysvsem.so extension is not loaded.
- Run the setup. The requirements check will pass everything. (see stage2.png)
- Continue to stage 3. Note that there are no valid database types to select. (see stage3.png)