Run of unchanged for ipp-usb

Try this locally (using the lintian-brush package):

debcheckout ipp-usb
cd ipp-usb
just-build
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autopkgtest [23:10:46]: starting date: 2021-02-15
autopkgtest [23:10:46]: version 5.16
autopkgtest [23:10:46]: host blodeuwedd; command line: /usr/bin/autopkgtest '/tmp/tmpfzro3559/build-area/ipp-usb_0.9.17-1~jan+unchanged1_amd64.changes' -- schroot unchanged-amd64-sbuild
['schroot', '--config', '--chroot', 'unchanged-amd64-sbuild'] unexpectedly produced stderr output `W: line 9 [unstable-amd64-sbuild] aliases: Alias ‘buster-backports-amd64-sbuild’ already associated with ‘unknown’ chroot
W: line 9 [unstable-amd64-sbuild] aliases: Alias ‘buster-backports-amd64-sbuild’ already associated with ‘unknown’ chroot
'
autopkgtest [23:10:46]: ERROR: testbed failure: cannot send to testbed: [Errno 32] Broken pipe

E: Autopkgtest run failed.

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| Cleanup                                                                      |
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