Comment 14 for bug 1899621

If you follow the above link (comment #11):
https://people.canonical.com/~ubuntu-archive/proposed-migration/focal/update_excuses.html#zlib
and click on the s390x status [here 'not a regression'], you should eventually find it - or just directly look here:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/s390x/b/burp/20201020_215047_4c004@/log.gz