crash on export-orig call to gbp buildpackage

[Christian Ehrhardt ]

Today I ran into this one:
$ git ubuntu export-orig
06/15/2020 16:11:30 - WARNING:pristine-tar data found for both debian and ubuntu, using ubuntu
06/15/2020 16:11:30 - ERROR:Command exited 127: gbp buildpackage --git-builder=/bin/true --git-pristine-tar --git-ignore-branch '--git-upstream-tag=pkg/upstream/ubuntu/%(version)s.bz2'
06/15/2020 16:11:30 - ERROR:stdout:
06/15/2020 16:11:30 - ERROR:stderr: /snap/core/current/bin/bash: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory

06/15/2020 16:11:38 - INFO:Downloading apache2_2.4.18.orig.tar.bz2 from launchpad.net (4.941 MiB)
06/15/2020 16:11:40 - INFO:Downloading apache2_2.4.18-2ubuntu4.2.debian.tar.xz from launchpad.net (0.369 MiB)
06/15/2020 16:11:41 - INFO:Successfully fetched:
/home/paelzer/work/apache2/apache2-ubuntu-git/.git/git-ubuntu-cache/apache2_2.4.18.orig.tar.bz2
using fetch_orig_from_launchpad(source=ubuntu)

You see the export works on the fallback path, so it isn't too severe for the time being.

I was then trying to recreate from scratch, the following seems to be enough to trigger the issue:

 cd /tmp/
 git ubuntu clone apache2
 cd apache2/
 git checkout pkg/ubuntu/xenial-devel
 git ubuntu export-orig

Are we missing a lib in the snap build?