I'm also having this issue trying to upgrade to 1.9.1. I haven't had any mods since 1.7. Everything is stock 1.8.1.2, except 1 line of code, which only is cosmetic. I also got the DB Error #1146
Table 'osTicket.ost_content' doesn't exist<br />
<br />
---- Backtrace ----<br />
#0 (root)/include/mysqli.php(169): osTicket->logDBError('DB Error #1146', '[ SELECT id FRO...')<br />
#1 (root)/include/class.page.php(218): db_query(' SELECT id FROM...')<br />
#2 (root)/scp/login.php(22): Page:('banner-staff')<br />
#3 (root)/scp/staff.inc.php(55): require('/home/xxxxxxxx/...')<br />
#4 (root)/scp/staff.inc.php(71): staffLoginPage('Authentication ...')<br />
#5 (root)/scp/admin.inc.php(16): require('/home/xxxxxxxx/...')<br />
#6 (root)/scp/upgrade.php(16): require_once('/home/xxxxxxxx/...')<br />
#7 {main}
Just wanted to add another verification of the issue. I had to revert back to my backup. I can take another stab at this in the next few evenings.--utopiasedge