I have Ubuntu 19.10 which was upgraded from Ubuntu 19.04. I seem to have the file `/etc/default/grub.d/50-curtin-settings.cfg` and causes this problem. It has the contents
```
GRUB_CMDLINE_LINUX_DEFAULT="maybe-ubiquity"
# Curtin disable grub os prober that might find other OS installs.
GRUB_DISABLE_OS_PROBER=true
GRUB_TERMINAL=console
```
Not sure what I am suppose to do with this file? The fix only effects installations which were never effected with this problem. I had to remove the `GRUB_CMDLINE_LINUX_DEFAULT="maybe-ubiquity"` line manually from there.
I have Ubuntu 19.10 which was upgraded from Ubuntu 19.04. I seem to have the file `/etc/default/ grub.d/ 50-curtin- settings. cfg` and causes this problem. It has the contents
``` LINUX_DEFAULT= "maybe- ubiquity" OS_PROBER= true console
GRUB_CMDLINE_
# Curtin disable grub os prober that might find other OS installs.
GRUB_DISABLE_
GRUB_TERMINAL=
```
Not sure what I am suppose to do with this file? The fix only effects installations which were never effected with this problem. I had to remove the `GRUB_CMDLINE_ LINUX_DEFAULT= "maybe- ubiquity" ` line manually from there.