Ubuntu 15.10 fails to install manually.

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Problem Description
===============
      After setting up partitions I get the error "Failed to remove conflicting files. The installer needs to remove operating system files from the install target, but was unable to do so. The install cannot continue".

Details
=====
System :- Power 8 VM

Failure :-
             The installer needs to remove operating system files from the install target, but was unable to do so. The install cannot continue

Link of Ubuntu 15.10 :-
              https://wiki.ubuntu.com/ppc64el/EarlyReleases

Analysis :-
1. I observed that , I proceeded with Guided Partition using LVM and next time I used Manual but used previous LVM partition then I was able to proceed with Installation.

2. Also I figured out that if I create only swap and / partition, it will install manually without any errors but If I create PRePboot ,swap and / , this error occurs.

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Default Comment by Bridge

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1472939/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

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------- Comment From <email address hidden> 2015-07-09 08:58 EDT-------
Please provide the following info so we can better understand the parameters of your install:

Boot type (install was booted from):
- CDROM / ISO image
- Network boot
- HDD
- Other (specify):

Bootloader (if other than CDROM):
- grub
- yaboot
- Other (specify):

Bootloader protocol (netboot only):
- TFTP (in most cases)
- HTTP (optional, grub only)
- Unsure

Kernel cmdline used to launch install (if other than CDROM):
- List cmdline or attach full bootloader file, if available.
- HINT: You may be able to interrupt the bootloader at the menu
screen and get the bootloader to display the kernel cmdline.

Install repository type:
- CDROM
- Local repo (specify URL)
- Internet repo/mirror (specify URL)
- HDD
- Other (specify):

Install repository location (if network install):
- Repository URL:
- HTTP or FTP proxy used, if applicable:

Was a response file used during install? (Yes/No):
- If Yes please attach the file
- If No please describe install steps

Point of failure:
1. Failed during boot of installer
2. Failed while accessing install media (e.g unable to access install repository or kickstart file)
3. Other failure during installation (stage 1)
4. Failed to reboot after installation
5. Problem during post-install (stage 2) configuration or other problem seen after system reboot

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2015-07-09 09:56 EDT-------
Boot type (install was booted from):
- CDROM / ISO image
- Network boot

Bootloader (if other than CDROM):
- grub

Bootloader protocol (netboot only):
- TFTP (in most cases)
- HTTP (optional, grub only)

Install repository type:
- Internet repo/mirror

Install repository location (if network install):
- Repository URL:
- HTTP or FTP proxy used, if applicable:

http://ports.ubuntu.com/ubuntu-ports/dists/wily/main/installer-ppc64el/current/images/netboot/

Was a response file used during install? (Yes/No):
- If No please describe install steps
1. Choose language.
2. Configure the network
3. Configure the clock
4. Detect the disks
5. Partition the disks
-> Choose guided then there is no error
-> Choose manual : prepboot, swap, '/' -> Error occurs with the message :
"Failed to remove conflicting files.The installer needs to remove operating system files from the install
target, but was unable to do so. The install cannot continue.

Point of failure:
3. Other failure during installation (stage 1) : While partitioning manually.

Kernel cmdline used to launch install (if other than CDROM):
List cmdline or attach full bootloader file, if available.
HINT: You may be able to interrupt the bootloader at the menu
screen and get the bootloader to display the kernel cmdline.

-setparams 'Install'
linux /install/vmlinux tasks=standard pkgsel/language-pack-p\
atterns= pkgsel/install-language-support=false --- quiet
initrd /install/initrd.gz

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Default Comment by Bridge

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-02-10 06:07 EDT-------
== Comment from Pooja ==

Hi,
I am trying to install Ubuntu 14.04.04 and I observed that same problem appears.

Below are the observations:

1. If we create PRePboot ,swap and / after setting up partitions we get the error "Failed to remove conflicting files. The installer needs to remove operating system files from the install target, but was unable to do so. The install cannot continue".

????????????????????????? [!!] Partition disks ???????????????????????????
? ?
? This is an overview of your currently configured partitions and mount ?
? points. Select a partition to modify its settings (file system, mount ?
? point, etc.), a free space to create partitions, or a device to ?
? initialize its partition table. ?
? ?
? ?
? SCSI1 (0,1,0) (sda) - 32.2 GB AIX VDASD ? ?
? > 1.0 MB FREE SPACE ? ?
? > #1 7.3 MB K ? ?
? > #2 10.0 GB F swap swap ? ?
? > #3 10.0 GB F ext4 / ? ?
? > 12.2 GB FREE SPACE ? ?
? ? ?
? Undo changes to partitions ?
? Finish partitioning and write changes to disk ?
? ?
? <Go Back> ?
? ?
???????????????????????????????????????????????????????????????????????????

Failure :-
????????????????????????? [!!] Partition disks ??????????????????????????
? ?
? Failed to remove conflicting files ?
? The installer needs to remove operating system files from the install ?
? target, but was unable to do so. The install cannot continue. ?
? ?
? <Go Back> <Continue> ?
? ?
?????????????????????????????????????????????????????????????????????????

2. If we create only swap and / after setting up partitions we get the error "No PowerPC PReP boot partition is found", if we still continue the installation, installation will be successful but system will not be able to bootup as there is no "boot partition".

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IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM ...

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------- Comment From <email address hidden> 2016-03-08 23:02 EDT-------
== Comment from Shriya Kulkarni ==

Hi,
I tested it on latest Ubuntu 16.04 with kernel version:4.4.0-6, creating partition with Manual option works fine.

Regards,
Shriya