Investigate why setup.sh causes debian testing unstable build to fail

[khos2ow]

Simple sudo apt upgrade -y in setup.sh causes the following error on debian testing:

Setting up sudo (1.9.17p2-3) ...
Configuration file '/etc/sudoers'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** sudoers (Y/I/N/O/D/Z) [default=N] ? dpkg: error processing package sudo (--configure):
 end of file on stdin at conffile prompt

[kgilmer]

I guess if there is something modifying sudo's conf, moving the apt operations before that would resolve this. Possibly also resolved by setting export DEBIAN_FRONTEND=noninteractive in the script to cause apt to stop asking questions on stdin.