The 32 bit cd works because it doesn't support UEFI. Booting the 64 bit
cd works as long as you do so in bios mode.
I suppose Ubiquity could switch back to bios grub when doing a side-by-
side install, and there's no ESP, even though you have booted the cd in
EFI mode.
** Changed in: ubiquity (Ubuntu)
Importance: Undecided => Medium
** Changed in: ubiquity (Ubuntu)
Status: Invalid => Triaged
** Description changed:
Currently, Ubiquity sometimes fails creating a correct Windows dualboot when:
- either it installs Ubuntu in EFI mode when Windows is installed in Legacy
mode ( examples: Bug #908109 , Bug #959446 , Bug #956412
http://ubuntuforums.org/showthread.php?p=12238420#post12238420 )
- or it installs Ubuntu in Legacy (not-EFI) mode when Windows is installed in
EFI mode. ( example:
http://ubuntuforums.org/showpost.php?p=12246811&postcount=6 )
In order to create a correct dualboot, Ubiquity should always install
Ubuntu in the same mode as Windows.
- I think the deep problem is that Ubiquity only looks at /sys/firmware/efi (or
dmesg | grep EFI) to determine if it is going to install in EFI mode or not.
AFAIK, dmesg only indicates the mode in which the BIOS boots the live media,
NOT the mode in which the BIOS boots the HDD.
- Remark: currently Ubuntu32bit is not EFI compatible (see Bug #1025555 ), so
Ubiquity32bit will always install in Legacy mode (which allowed the OP of Bug
#908109 to workaround the current bug).
-
- (this problem is more and more frequent as new computers generally come
- with EFI firmware)
+ This could be done by choosing between grub-efi and grub-pc based on the
+ presence of an existing ESP when performing a side-by-side install,
+ instead of whether the cd is booted in efi mode or not.
*************** WORKAROUND: using Boot-Repair to convert Ubuntu in the same
mode as Windows.
See https://help.ubuntu.com/community/UEFI
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https://bugs.launchpad.net/bugs/1050940
Title:
Ubiquity fails creating a correct Windows dualboot on EFI computers
(grub-pc <-> grub-efi)
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