[MULTI BOOT] Installer fails to offer option for dual boot.

[rcdawson]

When I get to the Installation type page I am offered only the following options:
Guided - use entire disk
Guided - use entire disk and set up LVM
Guided - use entire disk and set up encrypted LVM
Manual

I used the Windows disk manager to shrink the 497 GB, C drive partition to 142 GB, leaving 354 GB of free space.

In the installer, the partition that used to be C drive now consists of a 142 GB free space and 254 GB free space.

In the Windows disk manager I noticed that the windows partition was identified as being encrypted. When I checked in Control Panel, however, it said only that disk encription was waiting to be turned on, so I'm thinking it isn't actually encrypted.

I do notice that there is a 681.7 MB Windows Boot Manager Partition.

Any thoughts on how I can get to dual boot?

[jglen490]

Manual. When the disk partitioning step is displayed, select the unallocated space for use with Kubuntu. It will display a dropdown selection for a target to install boot files, you can select the existing boot manager partition, which should already be formatted as fat32. Or you can build a separate ESP for Linux in that unallocated space. The unallocated space that you use for Kubuntu itself should be formatted with ext4.

[claydoh]

I *think* if you had not shrunk the disk ahead of time, you would see the missing option. Depending on how much space was left on the Windows partition. It does not really take the un-partitioned free space into account so perhaps it does not see there being enough space to install?

Probably a bug in the installer?


Either do a manual install, or try un-shrinking Windows and let the installer resize things for you.

[Beerislife]

I used the Kubuntu Partition Manager on the installation USB stick to shrink my windows partition before running the install routine and then selected Manual partitioning. I had no problems using that method.

[rcdawson]

I don't believe that the problem arises from shrinking using Windows Disk Manager. Almost every instruction on how to dual boot says to use the Windows Disk Manager to shrink C drive.

Since the installation program's manual installation mode identifies what is left of the Windows C drive as a bitlocker partition, I'm assuming that the installer just cannot identify identify that it is a windows partition.

I've tried several things recommended here and elsewhere.
1. https://www.addictivetips.com/ubuntu...uring-install/
2. In Windows 10 encrypt C-drive, and then unencrypt it.

I am making several backups of the Windows installation, and I will proceed with installing Kubuntu. The first response suggested two possibilities:
(1) Devote all of the empty space to / partition, and then put the boot manager where the Windows boot manager presently resides.
(2) "Build a separate ESP for Linux in that unallocated space"

I understand how to do the first (or at least tthink I do.)

How does one do the second, and what might be the advantage of the second?

[claydoh]

(1) is fine.
As you already have an EFI directory it will be used automatically. Just mark the free space to be / and to have it formatted as ext4.


I know many how-tos mention resizing the Windows drive but IMO these are mostly copy- pasta. The Ubuntu installer can resize it automatically. There is a slider that can be used to give Kubuntu more or less space if desired.

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