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Old 01-09-2016, 03:18 AM   #1
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Distribution: Ubuntu 14.04 & 15.10
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Installing UBUNTU 15.10 into existing 14.04 - Partitions issue

Good morning to everybody,
I am not an expert and so, if you can, in your answer please give me the principle but also the operating details, I would really appreciate it.
This is my problem: I have happily installed UBUNTU 14.04 on an external HD 1TB and my gparted analysis give this picture:

sdb1 in ext4 used as root / with 14,65GB primary
sdb4 swap with 6 GB primary (I suppose)
sdb2 in ext4 used as home con 176 GB primary
sdb3 in ntfs /mnt/data with 703GB primary ,used as local storage and transit with Windows PCs to upload or download.
not allocated 30GB put apart for further installation as explained further.

I would like to install in the same HD an UBUNTU 15.10 , with the same UBUNTU 14.04 home ( giving instructions not to format ), same user name in order to maintain all preferences , but with a new / root partition where to install the 15.10.
However this is stopped as I can not have more than 4 primary partitions.
How should I move around maintaining the installed UBUNTU 14.04 with all the files and apps, to create a partition to use with UBUNTU 15.10 as / root?
Bear in mind that I do not care about “erasing” nTFS, as all data are immediately recoverable.
Thanks for your help and attention.
Old 01-09-2016, 02:16 PM   #2
Registered: Jun 2015
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There is a limit to four primary partitions on a hard drive. So that external must be partly repartitioned into two or three primary partitions and one extended partition. The extended partition can be divided into as many logical partitions as you want.

IMO, use a single /data partition for both operating systems instead of a /home partition for each operating system.

Backup all your data.

Use gparted on a linux live CD or DVD to:
1. Delete sdb3 and sdb4.
2. Shrink sdb2 to around 10 GB. Maybe less because most of the files that might go here will go on the /data partition.
3. Make a primary partition (sdb3) around the same size as your computer's RAM. Format it as /swap.
4. Make an extended partition containing all the rest of the hard drive space.
5. In the extended partition, make three logical partitions: sdb5 (around 65 GB, ext4, for second linux installation including home), sdb6 (around 200 GB, ext4, /data for both operating systems), sdb7 (rest of hard drive, NTFS, for storage and use with Windows PCs).

You may prefer partions of different sizes. But I don't think you can use fewer partitions.

Good luck.
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Old 01-09-2016, 07:21 PM   #3
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Running a common /home works fine with two releases - I do it regularly when re-installing a later version. Allows for a seamless fallback in need.
As advised above, you will need to create an extended partition, then use logical partitions. In that scenario there is no need for any primary partitions - they can all be logical. Putting as much as possible as logical allows for much greater flexibility. We need to know the exact layout of the disk. Post the output of his using [code][/code] tags.
sudo parted /dev/sdb "print free"


installing, partitions

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