Looks like a grub config syntax error, definitely not a kernel issue:
...
Found Debian GNU/Linux 10 (buster) on /dev/sdc2
error: syntax error.
error: Incorrect command.
error: syntax error.
Syntax error at line 178
Syntax errors are detected in generated GRUB config file.
Ensure that there are no errors in /etc/default/grub
and /etc/grub.d/* files or please file a bug report with
/boot/grub/grub.cfg.new file attached.
...
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1863752
Title:
Removal of linux-image-5.3.0-29-generic fails
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