I upgraded my Ubuntu boxes to 8.04 last night and ran into but one issue: my SlimServer (now SqueezeCenter) would not start. Apparently I’m not the only one with this problem, and solution for now is to jam some more lines into your /etc/apparmor.d/usr.sbin.mysqld
/var/lib/squeezecenter/cache/ r, /var/lib/squeezecenter/cache/my.cnf r, /var/lib/squeezecenter/cache/mysql.startup rw, /var/lib/squeezecenter/cache/mysql-error-log.txt rw, /var/lib/squeezecenter/cache/squeezecenter-mysql.pid w, /var/lib/squeezecenter/cache/squeezecenter-mysql.sock w, /var/lib/squeezecenter/cache/MySQL/ r, /var/lib/squeezecenter/cache/MySQL/** rwk,
According to the bug report, the installer is fixed in trunk, so with the next release (7.0.1?) this won’t be an issue.
Congrats to the Ubuntu guys for such a seamless upgrade! It was really smooth.