Build failure of network:osmocom:nightly/osmo-gsm-manuals in xUbuntu_20.04/x86_64

Visit https://build.opensuse.org/package/live_build_log/network:osmocom:nightly/osmo-gsm-manuals/xUbuntu_20.04/x86_64 Package network:osmocom:nightly/osmo-gsm-manuals failed to build in xUbuntu_20.04/x86_64 Check out the package for editing: osc checkout network:osmocom:nightly

Build failure of network:osmocom:nightly/osmo-gsm-manuals in xUbuntu_20.04/x86_64

Visit https://build.opensuse.org/package/live_build_log/network:osmocom:nightly/osmo-gsm-manuals/xUbuntu_20.04/x86_64 Package network:osmocom:nightly/osmo-gsm-manuals failed to build in xUbuntu_20.04/x86_64 Check out the package for editing: osc checkout network:osmocom:nightly