Anything that can get more complicated will get more complicated. Boot
loaders seem to be an example.
It used to be straightforward to read /boot/efi/EFI/fedora/grub.cfg.
Now, building the list of kernels for the menu is farmed out to blscfg (a
grub module).
I needed to have a Fedora box default to booting a kernel that isn't the
latest (because the latest cannot bring up the display on my computer).
1. I needed to make updates not delete the working kernel. Normally
updates keep only the last three kernels. As of today, two are duds.
Fix: change /etc/dnf/dnf.conf's installonly_limit from 3 to 0
2. Find the list of kernels known to grub:
sudo ls /boot/loader/entries/*.conf
3. set the default to one of those. Use the filename, without the
directory and without the .conf
sudo grub2-set-default
2733f1c892a5422c98bdb188c4f62737-5.10.9-201.fc33.x86_64
I don't know how long this sticks.
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