Comment 1 for bug 2035226

Ubuntu 20.04 or later hits this. Ubuntu 18.04 used in upstream-translation-update job does not hit this.

The detail is quoted from https://review.opendev.org/c/openstack/i18n/+/894512
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(g)awk in Ubuntu 20.04 or later (perhaps gawk >=5.0) has more strict
regexp check and the regexp passed to awk in generatepot.sh cannot
pass the regexp check. This means our script does not work on
Ubuntu 20.04 or later.
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