[Koha] problem installing Koha

[tommaso spazzali]

Hello,

I'm a newbie Koha User

I'm trying to install the default package on a Ubuntu server 16.04 LTS
(as suggested here https://wiki.koha-community.org/wiki/Ubuntu)
Version installed is: koha-common 3.22.06
and Mysql:5.7.12

Apparently I suceeded in localizing the application
http://www.koha.it/traduzione-it

but at step 3 of the seutp (op=importdatastructure) I get the error:

mysql: [Warning] Using a password on the command line interface can be
insecure. ERROR 1171 (42000) at line 1385: All parts of a PRIMARY KEY
must be NOT NULL; if you need NULL in a key, use UNIQUE instead


do you have any suggestion?

thanks a lot

tommaso