[ubuntu-uk] How does update-manager -d decide whether to offer upgrade?

[Sean Miller]

Had Feisty running on both laptop and desktop PCs.

On the laptop a week ago I decided to take the plunge, as I was having 
various issues with Feisty that I suspected might be fixed in gutsy, one 
of which was the inability to read memory cards through the integrated 
card reader... unfortunately it didn't fix the issue, and I had an issue 
with Thunderbird crashing (which was fixed by uninstalling the Calendar 
component - thanks to Ubuntu Wiki for that fix ;-)) but I am generally 
quite happy with Gutsy and would like to now put it on the Desktop too.

Unfortunately when I do "update-manager -d" I don't get offered the 
option to upgrade. Why is this? Seems odd that the laptop and the 
desktop would do two different things...

Anybody any ideas?

Sean