Hmm it looks like osprober somehow got disabled.
Putting GRUB_DISABLE_OS_PROBER=false in the config might have helped.
Im closing this due to being 5 years old, but please comment or open a
new one if you are still experiencing this problem.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1839815
Title:
Grub not showing in 19.04
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