I also have this problem running Ubuntu 17.04 with a TrendNet TEW-644UB
USB WiFi stick (ID 148f:2770 Ralink Technology, Corp. RT2770 Wireless
Adapter).

The symptoms are that it sees the networks but won't connect, even if
unencrypted.

The workaround in #1 also works for me.
Many thanks, Jesse.

This bug shouldn't be in a final release and it is inexcusable that it still 
hasn't been corrected two months later.
I expect that, like me, many people have wasted a lot of time before finding 
this workaround.
(I even ordered a new USB WiFi stick.)

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https://bugs.launchpad.net/bugs/1681513

Title:
  Ubuntu 17.04/17.10: New feature in NetworkManager stops several WiFi
  adapters from working (MAC Address Randomization issue)

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