Hi all!
I had such problem too. I examened all needed packages and settings and found the solution in config.php
My problem was solved by simply copying default config-dist.php to config.php and editing in it only the directives concerning database connetion and site directories.
You do not need to create your own config.php, just copy default config-dist.php to config.php and edit only thouse directives (don’t touch others):
$CFG->dbtype, $CFG->dbhost, $CFG->dbname, $CFG->dbuser, $CFG->dbpass, $CFG->wwwroot, $CFG->dirroot, $CFG->dataroot.
Hope it will be helpful.