Maybe your mirror is lagging behind a bit. I already see it in the .br mirror:
Version table:
5.1.2-1ubuntu3 500
500 http://ubuntu.c3sl.ufpr.br/ubuntu bionic/main amd64 Packages
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https://bugs.launchpad.net/bugs/1745817
Title:
autofs 5.1.2-1ubuntu2 crashes on nfs mount
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