> If you use the backports repository (i.e. if there are uncommented > lines containing the word "backports" in /etc/apt/sources.list), don't > upgrade to the recently backported versions of network-manager and > wpasupplicant until this issue[1] is fixed.
If you have already upgraded and need to revert to the previous versions, use $ sudo apt install network-manager=1.2.6-0ubuntu0.16.04.3 $ sudo apt install wpasupplicant=2.4-0ubuntu6.6 In order to upgrade all other packages without upgrading these two, use $ sudo apt-mark hold network-manager wpasupplicant before upgrading. When this issue is fixed, make these packages upgradable again with. $ sudo apt-mark unhold network-manager wpasupplicant
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