unity panel & launcher missing after update 16.04

i agreed to the updates today. after I restarted the computer as suggested, the unity panel and launcher disappears after login.

at the login window the panel shows up ok. it's only after i login that it disappears.

when I open programs via the terminal, the menu bar also is missing

Please help

ps. I already tried the solutions posted below (they don't work):

http://ift.tt/2a9D5xM

http://ift.tt/1lJJsab

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unity panel & launcher missing after update 16.04