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Old 09-04-2014, 08:31 PM   #1
julianvb
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Deleting Linux Logical Partitions


I would like to know how to delete an extended logical Linux partition such as /dev/sda5 or/dev/sda6 from my Ubuntu computer. I am providing various partition data below genrated by 'sudo blkid', 'sudo parted -l' and 'sudo fdisk -l'.

/dev/sda5: UUID="24239e68-00a6-4ca6-8cc1-c7f1f421e991" TYPE="ext2"
/dev/sda6: UUID="9508a7a7-7306-4f64-9f0f-077ea15f0124" TYPE="ext4"
/dev/sda7: UUID="8816c492-5934-4303-a241-bd3dd5be005d" TYPE="swap"
--------------------------------------------------------------------
Model: ATA ST380011A (scsi)
Disk /dev/sda: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
2 29.0GB 80.0GB 51.0GB extended boot
7 29.0GB 30.0GB 991MB logical linux-swap(v1)
6 30.0GB 78.4GB 48.4GB logical ext4
5 78.4GB 80.0GB 1600MB logical ext2
--------------------------------------------------------------------

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006733e

Device Boot Start End Blocks Id System
/dev/sda2 * 56643582 156301063 49828741 5 Extended
/dev/sda5 153176064 156301063 1562500 83 Linux
/dev/sda6 58580992 153176063 47297536 83 Linux
/dev/sda7 56643584 58578943 967680 82 Linux swap / Solaris

Partition table entries are not in disk order
------------------------------------------------------------------
When I try to umount /dev/sda6 or /dev/sda6, Linux tells me that the device is busy. If I try to delete them via gparted, I am told that they can't be dismounted from mount points / and /var/spool/hylafax/etc.

Any help will be much appreciated.

julianvb
 
Old 09-04-2014, 08:49 PM   #2
Randicus Draco Albus
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That means sda6 has an entry in fstab that includes auto-mounting the partition. If you are using gparted that is installed on your system, it cannot dismount the partition. You would need to either boot a live disc to modify the partition or edit fstab so that the partition is not mounted upon boot.
 
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Old 09-04-2014, 09:11 PM   #3
EDDY1
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What is purpose of deleting /, your system will be broken. You can move to a primary partition, then remove it.
 
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Old 09-04-2014, 11:06 PM   #4
yancek
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Posting your intentions/goals would be useful and someone may be able to give a suggstion. If you want to remove the system, copy any data you have on it to some other medium and format the partition.
 
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Old 09-05-2014, 07:28 AM   #5
julianvb
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Hi, Everyone,

My question reflects my newness to Linux. I thought either /dev/sda6 or /dev/sda5 was created when I attempted but failed to installed Linux Mint 17 about a month ago. In other words, I am trying to remove an unneeded partition. Please excuse my obvious ignorance of Linux.

julianvb
 
Old 09-05-2014, 07:36 AM   #6
julianvb
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Randicus Draco Albus,

Thanks for the suggestion. I did try to modify the fstab file by commenting out the line involving /dev/sda6 before posting my question. It's clear that my modification wasn't correct or complete and therefore failed.

julianvb

Last edited by julianvb; 09-05-2014 at 07:38 AM.
 
Old 09-05-2014, 07:50 AM   #7
Randicus Draco Albus
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That raises more questions than it answers.

Was the Mint installation a second system in a dual-boot set-up with Ubuntu and you want to delete Mint's partitions? If so, why are the partitions being mounted by Ubuntu?

Quote:
It's clear that my modification wasn't correct or complete and therefore failed.
Post your fstab for us to look at.
 
Old 09-05-2014, 11:20 AM   #8
EDDY1
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3 partitions I would have assumed /, /home & swap.
Can you boot into rescue mode?
Also did you comment the entry out or did you delte it?

After looking at the partition types & UUID's it would appear that the entry you are trying to remove is sda5 which is ext2 & mint most likely ustilizes ext4. But post your fstab to be sure.

Last edited by EDDY1; 09-05-2014 at 11:26 AM.
 
Old 09-05-2014, 08:21 PM   #9
julianvb
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2014-09-05
Hi, Everyone,

About a month ago as I was having a GUI problem with Ubuntu 12.04 (which I finally fixed by deleting the .Xauthority file via text mode), I attempted to install Linux Mint 17 with Linux Mint 11 as the only viable resident O.S. on the computer. Even though I didn't succeed in installing Mint 17, Linux created a partition for it any way. That's is how this Mint 17-associated partition came into being.

When I tried and failed in modifying /etc/fstab in order to remove /dev/sda6, simply nothing happened. Here's the original and current /etc/fstab file. To avoid confusion and unnecessary problems, I've discarded my modified version of the file.
--------------------------------------------------------------------------------------------------------------
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda6 during installation
UUID=9508a7a7-7306-4f64-9f0f-077ea15f0124 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=22cc3707-a892-448d-9c7d-13e69f11d00f none swap sw 0 0
----------------------------------------------------------------------------------------------------
Is rescue mode the same as recovery mode? If the above information does not suffice, I'll do more probing. Thanks again.

julianvb

Last edited by julianvb; 09-05-2014 at 08:54 PM.
 
Old 09-05-2014, 08:52 PM   #10
EDDY1
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So did you comment out sda5 or sda6, because on first post sda6 matches the sda5 entry in fstab. sda 7 doesn' match the swap from fstab either.
 
Old 09-05-2014, 10:59 PM   #11
julianvb
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Hi, Everyone,

Here's the latest picture of my Linux computer's partitions at the moment with Ubuntu 12.04 as its sole OS. I hope the data can be of some use.

julianvb

(1) blkid output:

/dev/sda5: UUID="24239e68-00a6-4ca6-8cc1-c7f1f421e991" TYPE="ext2"
/dev/sda6: UUID="9508a7a7-7306-4f64-9f0f-077ea15f0124" TYPE="ext4"
/dev/sda7: UUID="8816c492-5934-4303-a241-bd3dd5be005d" TYPE="swap"

(2) fdisk output:

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006733e

Device Boot Start End Blocks Id System
/dev/sda2 * 56643582 156301063 49828741 5 Extended
/dev/sda5 153176064 156301063 1562500 83 Linux
/dev/sda6 58580992 153176063 47297536 83 Linux
/dev/sda7 56643584 58578943 967680 82 Linux swap / Solaris

Partition table entries are not in disk order

(3) parted output:
Model: ATA ST380011A (scsi)
Disk /dev/sda: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
2 29.0GB 80.0GB 51.0GB extended boot
7 29.0GB 30.0GB 991MB logical linux-swap(v1)
6 30.0GB 78.4GB 48.4GB logical ext4
5 78.4GB 80.0GB 1600MB logical ext2

(4) Gparted listing:

Partition File System Mount Point Size used Unused Flags
unallocated unallocated - 27.01GiB - - -
/dev/sda2 extended - 47.52GiB - - boot
/dev/sda7 linux-swap - 945MiB - - -
/dev/sda6 ext4 /, /var/spool/hylaxfax/etc 45.11GiB 13.41GiB 31.70GiB -
/dev/sda5 ext2 - 1.49GiB 1.49GiB 0.00 -

------------------------------------------------------------------------------------------------------------------------------------
I think /dev/sda5 was created when I unsuccessfully attempted to install Linux Mint 17 with Linux Mint 11 running as the only viable OS on my 'dual-boot' computer.
------------------------------------------------------------------------------------------------------------------------------------

Last edited by julianvb; 09-05-2014 at 11:11 PM.
 
Old 09-06-2014, 12:37 AM   #12
EDDY1
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Which 1 did you comment out, did you comment out sda5 or sda6.
can you still mount the 2 partitions sda5 & sda6?
Post /etc/fstab from both but label them.
 
Old 09-06-2014, 11:25 PM   #13
julianvb
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2014-09-07
EDDY1,

Nothing happened after I commented out both the sda5 and sda6 lines in /etc/fstab and the /var/spool//hylafax/etc mount-point line in /etc/mtab. However, I later learned that in order for Gparted to modify /dev/sda5 or /dev/sda6 I needed to unmount the linux-swap partition /dev/sda7 via 'swapoff -a'. Indeed, I was able to unmount and then delete /dev/sda6, only to my regret. I underestimated the importance of /dev/sda6 and now deserve to be sent to grub-rescue land! I've restored the deleted partition but grub still boots to rescue mode. My apology to you all. I'll re-post here when I find my way back to grub and not grub-rescue. Many thanks again to you all.

julianvb

Last edited by julianvb; 09-06-2014 at 11:33 PM.
 
Old 09-06-2014, 11:38 PM   #14
EDDY1
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Did the UUID change when partition was restored?
Or did the restored partition change location to sda7?
 
Old 09-07-2014, 02:05 PM   #15
julianvb
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EDDY1,

Here's my new report based on my Browser Linux CD, which turns out to be a handy tool. Thanks again.

julianvb

New blkid-output from Browser Linux CD:


/dev/loop0: TYPE="squashfs"
/dev/loop1: UUID="62ecbddf-56f4-4495-9696-0ba697867cd2" TYPE="ext2"
/dev/sda5: UUID="24239e68-00a6-4ca6-8cc1-c7f1f421e991" TYPE="ext2"
/dev/sda6: UUID="8816c492-5934-4303-a241-bd3dd5be005d" TYPE="swap"
/dev/sda7: UUID="c6a171de-d531-4965-9edb-018122283eef" TYPE="ext4"
----------------------------------------------------------------------------
New fdisk-output from Browser Linux CD:

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda2 * 3526 9730 49828741 5 Extended
/dev/sda5 9535 9730 1562500 83 Linux
/dev/sda6 3526 3647 967680 82 Linux swap / Solaris
/dev/sda7 3647 9535 47296512 83 Linux

Partition table entries are not in disk order
----------------------------------------------------------------------------
My interpretation of above data:

New /dev/sda2 is same as /dev/loop1 and old /dev/sda2.
New /dev/sda5 is same as old /dev/sda5, was created for Mint 17.
New /dev/sda6 is same as old /dev/sda7, namely linux-swap partition.
New /dev/sda7 replaces old /dev/sda6 but new UUID is different; old UUID was
reported in an earlier post by me beginning with "UUID=9508a7a7....".

This may be cause of my grub-rescue problem.

Last edited by julianvb; 09-07-2014 at 02:07 PM.
 
  


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