[Koha] Error connecting to MySQL

Greetings all, I’m a new user of Koha, attempting to set it up for my wife’s class library. I’ve successfully installed it on an Ubuntu 14.04 server. I can log in to the “intra” staff section at lib-admin.domainname.com <http://lib-admin.domainname.com/> and everything there works correctly, but going to lib.domainname.com <http://lib.domainname.com/> gives me the error message “Error connecting to MySQL” without any further information. I’m sure it’s something quite simple that I’ve overlooked, but I can’t figure out what that might be. Are there some error logs I should be checking? Some obvious switch I haven’t flipped? Thanks in advance for your help. -Jonathan Shearon