This is broken for me in 12.10, and none of the suggested workarounds helped. I removed the PPAs throught the GUI, and double-checked that they were gone from /etc/apt/sources.list and /etc/apt/sources.list.d. I also tried removing the cache in /var/cache/software-center/ and running "update-software-center". I also ensured that I had no packages installed from the problematic PPAs (I didn't).
Still no luck, the PPA items remain in Ubuntu Software Center under the "All Software" and "Installed" dropdown menus.
This is broken for me in 12.10, and none of the suggested workarounds helped. I removed the PPAs throught the GUI, and double-checked that they were gone from /etc/apt/ sources. list and /etc/apt/ sources. list.d. I also tried removing the cache in /var/cache/ software- center/ and running "update- software- center" . I also ensured that I had no packages installed from the problematic PPAs (I didn't).
Still no luck, the PPA items remain in Ubuntu Software Center under the "All Software" and "Installed" dropdown menus.