[Koha] password and usrname + koha 3

[Kete Jourge]

hi 
i want to change koha 3 password and username on my OS ubuntu i used the mysql command 

mysql> SET PASSWORD FOR 'kohaadmin'@'localhost' = PASSWORD('newpassword');
Query OK, 0 rows affected (0.10 sec)

but when i login to koha 

Koha error
The following fatal error has occurred:
Access denied for user 'kohaadmin'@'localhost' (using password: YES) at /usr/share/koha/lib/C4/Context.pm line 666.
Compilation failed in require at /usr/share/koha/lib/C4/Circulation.pm line 25.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Circulation.pm line 25.
Compilation failed in require at /usr/share/koha/lib/C4/Overdues.pm line 24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Overdues.pm line 24.
Compilation failed in require at /usr/share/koha/lib/C4/Members.pm line 27.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Members.pm line 27.
Compilation failed in require at /usr/share/koha/lib/C4/Auth.pm line 27.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 27.
Compilation failed in require at /usr/share/koha/intranet/cgi-bin/cataloguing/addbiblio.pl line 24.
BEGIN failed--compilation aborted at /usr/share/koha/intranet/cgi-bin/cataloguing/addbiblio.pl line 24.

shall i must change the password in file in etc like koha on windows ... i asking what is this file i shall change password in it 

thank's 


      
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