ubuntu_kvm_smoke_test failed on H s390x LPAR (permission denied)

It looks like the uvt-simplestreams-libvirt command failed to fetch the image

+ SUT=bjf-test
+ SSH_KEY=/home/ubuntu/.ssh/id_rsa
+ SSH_OPTIONS='-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -i /home/ubuntu/.ssh/id_rsa'
++ lsb_release -c
++ awk '{print$2}'
+ DISTRO=hirsute
+ ARCHITECTURE=s390x
+ trap cleanup EXIT
+ '[' -z s390x ']'
+ kvm-ok
+ '[' 0 '!=' 0 ']'
+ '[' '!' -f /home/ubuntu/.ssh/id_rsa ']'
+ '[' s390x = ppc64el ']'
++ uvt-simplestreams-libvirt query
++ grep -P 'hirsute.*s390x'
+ image=
+ '[' -z '' ']'
+ uvt-simplestreams-libvirt sync --source http://cloud-images.ubuntu.com/daily release=hirsute arch=s390x
Traceback (most recent call last):
  File "/usr/bin/uvt-simplestreams-libvirt", line 27, in <module>
    uvtool.libvirt.simplestreams.main()
  File "/usr/lib/python3/dist-packages/uvtool/libvirt/simplestreams.py", line 332, in main
    args.func(args)
  File "/usr/lib/python3/dist-packages/uvtool/libvirt/simplestreams.py", line 266, in main_sync
    tmirror.sync(smirror, initial_path)
  File "/usr/lib/python3/dist-packages/simplestreams/mirrors/__init__.py", line 91, in sync
    return self.sync_index(reader, path, data, content)
  File "/usr/lib/python3/dist-packages/simplestreams/mirrors/__init__.py", line 254, in sync_index
    self.sync(reader, path=epath)
  File "/usr/lib/python3/dist-packages/simplestreams/mirrors/__init__.py", line 89, in sync
    return self.sync_products(reader, path, data, content)
  File "/usr/lib/python3/dist-packages/simplestreams/mirrors/__init__.py", line 355, in sync_products
    self.insert_item(item, src, target, pgree, ipath_cs)
  File "/usr/lib/python3/dist-packages/uvtool/libvirt/simplestreams.py", line 235, in insert_item
    pool_metadata[encoded_libvirt_name] = (
  File "/usr/lib/python3/dist-packages/uvtool/libvirt/simplestreams.py", line 79, in __setitem__
    with codecs.open(
  File "/usr/lib/python3.9/codecs.py", line 905, in open
    file = builtins.open(filename, mode, buffering)
PermissionError: [Errno 13] Permission denied: '/var/lib/uvtool/libvirt/metadata/x-uvt-b64-Y29tLnVidW50dS5jbG91ZC5kYWlseTpzZXJ2ZXI6MjEuMDQ6czM5MHggMjAyMDExMzA='
+ uvt-kvm create bjf-test release=hirsute arch=s390x
uvt-kvm: error: no images found that match filters ['release=hirsute', 'arch=s390x'].
+ uvt-kvm wait bjf-test --insecure --ssh-private-key-file /home/ubuntu/.ssh/id_rsa
uvt-kvm: error: libvirt: Domain not found: no domain with matching name 'bjf-test'
++ uvt-kvm ip bjf-test
uvt-kvm: error: libvirt: Domain not found: no domain with matching name 'bjf-test'
+ ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -i /home/ubuntu/.ssh/id_rsa ubuntu@ uname -a
++ cut '-d ' -f 2
+++ uvt-kvm ip bjf-test
uvt-kvm: error: libvirt: Domain not found: no domain with matching name 'bjf-test'
++ ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -i /home/ubuntu/.ssh/id_rsa ubuntu@ lsb_release -c
+ RESULT=
+ '[' '' '!=' hirsute ']'
+ echo '** ERROR: The codename returned from lsb_release -c was (' ') and we were expecting '\''hirsute'\'''
+ exit 1
+ cleanup
+ uvt-kvm destroy bjf-test
uvt-kvm: error: domain 'bjf-test' not found.
+ '[' s390x = ppc64el ']'