package:docker.io:20.10.12-0ubuntu2~18.04.1
Setting up docker.io (20.10.12-0ubuntu2~18.04.1) ...
Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66, <GEN0> line 6.
Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67, <GEN0> line 6.
Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68, <GEN0> line 6.
Use of uninitialized value in string eq at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 202, <GEN0> line 6.
Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66, <GEN0> line 6.
Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67, <GEN0> line 6.
Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68, <GEN0> line 6.
Use of uninitialized value $ret in string eq at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 212, <GEN0> line 6.
Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 6.
Use of uninitialized value $val in substitution (s///) at /usr/share/perl5/Debconf/Format/822.pm line 83, <GEN2> line 6.
Use of uninitialized value $val in concatenation (.) or string at /usr/share/perl5/Debconf/Format/822.pm line 84, <GEN2> line 6.
dpkg: error processing package docker.io (--configure):
 installed docker.io package post-installation script subprocess returned error exit status 128