Not a winbind bug:
Setting up winbind (2:3.5.8~dfsg-1ubuntu2.2) ...
Use of uninitialized value $reply in scalar chomp at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66.
Use of uninitialized value $reply in concatenation (.) or string at
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm
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https://bugs.launchpad.net/bugs/801729
Title:
package winbind 2:3.5.8~dfsg-1ubuntu2.2 failed to install/upgrade:
subprocess installed post-installation script