Lutris won't start

i installed Lutris on Ubuntu MATE 16.04 LTS (Xenial Xerus) 64-bit and it just won’t start when i open it from the menu.

when i run lutris command in terminal i get:

(lutris:17849): Gtk-WARNING **: Theme parsing error: gtk-main.css:69:33: Failed to import: Error opening file: No such file or directory
Traceback (most recent call last):
File “/usr/bin/lutris”, line 111, in
File “/usr/lib/python2.7/dist-packages/lutris/”, line 59, in check_config
File “/usr/lib/python2.7/dist-packages/lutris/”, line 111, in syncdb
sql.db_update(PGA_DB, ‘games’, {‘runner’: ‘mame’}, (‘runner’, ‘sdlmame’))
File “/usr/lib/python2.7/dist-packages/lutris/util/”, line 49, in db_update
cursor.execute(query, field_values + condition_value)
sqlite3.OperationalError: attempt to write a readonly database

How to fix it?

check that ~/.local/share/lutris/pga.db is writable