If the user is absent, then create it:
a) For MySQL server version 5.1:
#mysql -u admin -p`cat /etc/psa/.psa.shadow` mysql -sNe "insert into mysql.user values ('localhost','pp_sb_db','*3B063F312BAD7DB54911C318959EB12FF43925DB','N','N','N','N','N','N','N', 'N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N', 'N','','','','',0,0,0,0);"
b) For MySQL server version 5.5:
#mysql -u admin -p`cat /etc/psa/.psa.shadow` mysql -sNe "insert into mysql.user values ('localhost','pp_sb_db','*5D648C6BA7EC62DCBE81954B0FA0F9E18FFFF856','N','N','N','N','N','N','N', 'N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N', 'N','','','','',0,0,0,0,'',NULL);"