Comment 10 for bug 1509140

Ok, I can confirmed that the issue is solved for me now. The issue was related to KWallet/Secret Agent not running. By restarting KDED things magically started working.

I *think* the root cause might be that I was using Kubuntu Updates (initially) and Kubuntu CI Stable (later on) PPAs on Vivid. All PPAs got automatically disabled on upgrade to Willy but did leave some files lingering (as they are at higher version than Willy).

I did the following steps (not all might be necessary):

- opened KWallet, created a new wallet and removed old one
- restarted KDED, added new wifi connection, disconnected from wifi, reconnected successfully (but connection editor still crashes on edit)
- used ppa-purge to downgrade all packages from above mentioned PPAs (need to readd PPAs first), used accepted answer on http://askubuntu.com/questions/363653/remove-all-packages-installed-from-a-ppa as guide
- confirmed that connection editor no longer crashes
- rebooted, wifi automatically connected, connection editor is working, KWallet shows connection I created