Public bug reported:

Running Hirsute daily build.

How to reproduce:
1) Use EFI mode to boot iso image (tried hirsute daily build iso, but probably 
exists in previous releases as well)
2) Choose 'Something else' option and proceed with manual partition method
2) For partitioning, create two partitions, one as an EFI partition and rest as 
root partition with jfs file system. No separate /boot partition.
3) Installation completes. Reboot the system.

Expected: System boots normal.

Actual: Boot fails and drops to grub prompt. Doing ls on jfs partition
gives 'No known filesystem detected' error.

Note: 
1) Root on jfs install works fine for BIOS mode and also when a separate /boot 
partition is selected.
2) Ubiquity does not warn that a separate /boot partition is required for jfs 
on efi system (like it does for encrypted installs).

** Affects: grub (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: grub (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: ubiquity (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: jfsutils (Ubuntu)

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https://bugs.launchpad.net/bugs/1921826

Title:
  jfs install in efi mode drops to grub if no separate /boot partition

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