Comment 4 for bug 1306838

Generally, the release upgrader disables things like PPAs but because you said Yes to the no valid mirror found questions it just auto-updated everything to trusty.

"No valid mirror found

While scanning your repository information no mirror entry for the
upgrade was found. This can happen if you run an internal mirror or
if the mirror information is out of date.

Do you want to rewrite your 'sources.list' file anyway? If you choose
'Yes' here it will update all 'saucy' to 'trusty' entries.
If you select 'No' the upgrade will cancel.

Continue [yN] y"