[Bug 900245] Re: [12.04] Ubiquity creates useless EFI partition

[YannUbuntu]

After further investigation, it seems that Partman correctly detects EFI partition when it is FAT16, but not when it is FAT32.
Whatever the size of the FAT16 or FAT32 partition.

Consequence: Ubiquity correctly re-uses FAT16 EFI partition, but not
FAT32 EFI partition.

** Summary changed:

- [12.04] Ubiquity creates useless EFI partition
+ [12.04] Ubiquity/Partman do not re-use/detect FAT32 EFI partition

** Description changed:

  On Ubuntu 11.10 and 12.04 alpha
  
- On a EFI system which already contains a EFI partition, when the user
- chooses "Install Ubuntu alongside them" (see attached screenshot) ,
+ On a EFI system which already contains a FAT32 EFI partition, when the
+ user chooses "Install Ubuntu alongside them" (see attached screenshot) ,
  Ubiquity will create another EFI partition, but will not use it. Instead
  it will use the first EFI partition detected on the disk.
  
  For example, if you install Ubuntu 11.04, then 11.10, then 12.04 alpha
  on a EFI system, you will find that 3 EFI partitions are created, but
  only the 1st EFI partition will be used (grubx64.efi will be updated
  each time). The 2 other EFI partitions will remain useless (empty).
  
- Remark: if the user chooses "Something else" and creates a root (/)
- partition, Ubiquity will correctly detect and use the existing EFI
- partition.
+ Remarks: 
+ - if the user chooses "Something else" and creates a root (/) partition, Ubiquity will correctly detect and use the existing EFI partition.
+ - if the EFI partition is FAT16, it will be correctly detected by Partman, and Ubiquity will correctly use it (and won't create additional EFI partition)
  
  (translated from French: http://forum.ubuntu-
  fr.org/viewtopic.php?pid=7332931#p7332931 )

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https://bugs.launchpad.net/bugs/900245

Title:
  [12.04] Ubiquity/Partman do not re-use/detect FAT32 EFI partition

Status in “partman-auto” package in Ubuntu:
  Incomplete

Bug description:
  On Ubuntu 11.10 and 12.04 alpha

  On a EFI system which already contains a FAT32 EFI partition, when the
  user chooses "Install Ubuntu alongside them" (see attached screenshot)
  , Ubiquity will create another EFI partition, but will not use it.
  Instead it will use the first EFI partition detected on the disk.

  For example, if you install Ubuntu 11.04, then 11.10, then 12.04 alpha
  on a EFI system, you will find that 3 EFI partitions are created, but
  only the 1st EFI partition will be used (grubx64.efi will be updated
  each time). The 2 other EFI partitions will remain useless (empty).

  Remarks: 
  - if the user chooses "Something else" and creates a root (/) partition, Ubiquity will correctly detect and use the existing EFI partition.
  - if the EFI partition is FAT16, it will be correctly detected by Partman, and Ubiquity will correctly use it (and won't create additional EFI partition)

  (translated from French: http://forum.ubuntu-
  fr.org/viewtopic.php?pid=7332931#p7332931 )

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