Here is the what caused the error:
Setting up tasksel (2.70ubuntu5) ...
No protocol specified
Gtk-WARNING **: cannot open display: :0.0 at
/usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 60.
dpkg: error processing tasksel (--configure):
subprocess post-installation script returned error exit status 1
It looks like for some reason debconf can not connect to your display
and fails instead of falling back to a frontend like "dialog". I
reassign.
** Changed in: debconf (Ubuntu)
Sourcepackagename: update-manager => debconf
Importance: Undecided => Medium
Status: Incomplete => Confirmed
** Summary changed:
- package update-manager 1:0.87.24 failed to install/upgrade: ErrorMessage:
SystemError in cache.commit(): E:Sub-process /usr/bin/dpkg returned an error
code (1)
+ upgrade fails if gnome debconf frontend can not connect to $DISPLAY
--
upgrade fails if gnome debconf frontend can not connect to $DISPLAY
https://bugs.launchpad.net/bugs/222365
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