The apparmor-caused issue of Guest account not being able to run suid programs is actually farther-reaching. Beyond chromium, ping, virtualbox, and other programs that require suid binaries. gksudo doesn't work, which means that most of the items on the System|Administration menu fail with no error message. For example, the guest user selects System|Administration|Synaptic, and nothing happens. Perhaps apparmor could display a friendly GUI error message, or perhaps gksudo could be called through a wrapper that presents a friendly GUI error message?
The apparmor-caused issue of Guest account not being able to run suid programs is actually farther-reaching. Beyond chromium, ping, virtualbox, and other programs that require suid binaries. gksudo doesn't work, which means that most of the items on the System| Administration menu fail with no error message. For example, the guest user selects System| Administration| Synaptic, and nothing happens. Perhaps apparmor could display a friendly GUI error message, or perhaps gksudo could be called through a wrapper that presents a friendly GUI error message?