Looks like some widget is incompatible with that version of plasma.
Press Ctrl+Alt+F2 -> enter konsole -> run -> enter rm .kde/share/config/plasma*
-> enter plasma-desktop
that should recover plasma
** Changed in: kdebase-workspace (Ubuntu)
Status: New => Invalid
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after backport upgrade plasma-desktop fails to start on login
https://bugs.launchpad.net/bugs/528809
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