Delete old version of ubuntu

Asked by William Deese on 2020-10-14

Ubuntu 16.04 and 18.04 were on my hard disk, when I installed Ubuntu 20.04 a few months ago. I selected the option to remove all previous versions. Version 18.04 was erased when 20.04 was installed; however 16.04 persisted and still appears in the boot list at start-up. How do I completely remove 16.04, so there is only one large partition with 20.04?

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Solved by:
actionparsnip
Solved:
2020-10-14
Last query:
2020-10-14
Last reply:
2020-10-14

What is the output of:

sudo dpkg -l | grep linux-image; df -h

Thanks

William Deese (williamdeese99) said : #2

rc  linux-image-5.4.0-26-generic               5.4.0-26.30                         amd64        Signed kernel image generic
rc  linux-image-5.4.0-33-generic               5.4.0-33.37                         amd64        Signed kernel image generic
rc  linux-image-5.4.0-37-generic               5.4.0-37.41                         amd64        Signed kernel image generic
rc  linux-image-5.4.0-39-generic               5.4.0-39.43                         amd64        Signed kernel image generic
rc  linux-image-5.4.0-40-generic               5.4.0-40.44                         amd64        Signed kernel image generic
rc  linux-image-5.4.0-42-generic               5.4.0-42.46                         amd64        Signed kernel image generic
rc  linux-image-5.4.0-45-generic               5.4.0-45.49                         amd64        Signed kernel image generic
ii  linux-image-5.4.0-47-generic               5.4.0-47.51                         amd64        Signed kernel image generic
ii  linux-image-5.4.0-48-generic               5.4.0-48.52                         amd64        Signed kernel image generic
ii  linux-image-generic-hwe-20.04              5.4.0.48.51                         amd64        Generic Linux kernel image
Filesystem      Size  Used Avail Use% Mounted on
udev             16G     0   16G   0% /dev
tmpfs           3.2G  1.9M  3.2G   1% /run
/dev/sda5       916G   28G  842G   4% /
tmpfs            16G   25M   16G   1% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs            16G     0   16G   0% /sys/fs/cgroup
/dev/loop2      9.2M  9.2M     0 100% /snap/canonical-livepatch/95
/dev/loop0       55M   55M     0 100% /snap/core18/1880
/dev/loop4      162M  162M     0 100% /snap/chromium/1320
/dev/loop5       98M   98M     0 100% /snap/core/9993
/dev/loop7      164M  164M     0 100% /snap/spotify/41

On Wednesday, October 14, 2020 13:45 EDT, actionparsnip <email address hidden> wrote:
Your question #693467 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/693467

Status: Open => Needs information

actionparsnip requested more information:
What is the output of:

sudo dpkg -l | grep linux-image; df -h

Thanks

-- To answer this request for more information, you can either reply to
this email or enter your reply at the following page:
https://answers.launchpad.net/ubuntu/+question/693467

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Looks ok, run:

sudo dpkg -P `dpkg -l | grep ^rc | awk {'print $3'}`

Should remove any packages with residual configuration files and remove those kernels for you.

If you then reboot:

sudo reboot

Is it better?

William Deese (williamdeese99) said : #4

This is the output after running the last dpkg command.

Package 5.4.0-26.30 listed more than once, only processing once.
Package 5.4.0-33.37 listed more than once, only processing once.
Package 5.4.0-37.41 listed more than once, only processing once.
Package 5.4.0-39.43 listed more than once, only processing once.
Package 5.4.0-40.44 listed more than once, only processing once.
Package 5.4.0-42.46 listed more than once, only processing once.
Package 5.4.0-45.49 listed more than once, only processing once.
dpkg: warning: ignoring request to remove 5.4.0-26.30 which isn't installed
dpkg: warning: ignoring request to remove 5.4.0-33.37 which isn't installed
dpkg: warning: ignoring request to remove 5.4.0-37.41 which isn't installed
dpkg: warning: ignoring request to remove 5.4.0-39.43 which isn't installed
dpkg: warning: ignoring request to remove 5.4.0-40.44 which isn't installed
dpkg: warning: ignoring request to remove 5.4.0-42.46 which isn't installed
dpkg: warning: ignoring request to remove 5.4.0-45.49 which isn't installed

After rebooting, the grub screen shows:
Ubuntu
* Advanced options for Ubuntu
Memory test (memtest86t)
Memory test (memtest86t serial console 115200)
Ubuntu 16.04.6 LTS (16.04) (on /dev/mapper/ubuntu--vg-root)
Advanced options for Ubuntu 16.04 LTS (16.04) (on /dev/mapper/ubuntu--vg-root)

On Wednesday, October 14, 2020 14:30 EDT, actionparsnip <email address hidden> wrote:
 Your question #693467 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/693467

Status: Open => Answered

actionparsnip proposed the following answer:
Looks ok, run:

sudo dpkg -P `dpkg -l | grep ^rc | awk {'print $3'}`

Should remove any packages with residual configuration files and remove
those kernels for you.

If you then reboot:

sudo reboot

Is it better?

-- If this answers your question, please go to the following page to let us
know that it is solved:
https://answers.launchpad.net/ubuntu/+question/693467/+confirm?answer_id=2

If you still need help, you can reply to this email or go to the
following page to enter your feedback:
https://answers.launchpad.net/ubuntu/+question/693467

You received this question notification because you asked the question.

If you boot as normal and run:

lsb_release -a; uname -a

What is the output please?

William Deese (williamdeese99) said : #6

No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 20.04.1 LTS
Release:    20.04
Codename:    focal
Linux study 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

On Wednesday, October 14, 2020 15:05 EDT, actionparsnip <email address hidden> wrote:
 Your question #693467 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/693467

Status: Open => Needs information

actionparsnip requested more information:
If you boot as normal and run:

lsb_release -a; uname -a

What is the output please?

-- To answer this request for more information, you can either reply to
this email or enter your reply at the following page:
https://answers.launchpad.net/ubuntu/+question/693467

You received this question notification because you asked the question.

Looks ok to me. I'm guessing the GRUB thing is just cosmetic

You could look in /etc/grub.d to see where it's being set but ultimately Focal is booting OK

William Deese (williamdeese99) said : #9

Thanks actionparsnip, that solved my question.

Manfred Hampl (m-hampl) said : #10

Filesystem Size Used Avail Use% Mounted on
/dev/sda5 916G 28G 842G 4% /

and

Ubuntu 16.04.6 LTS (16.04) (on /dev/mapper/ubuntu--vg-root)

Apparently there are two separate installations of Ubuntu on your hard disk(s).
Ubuntu 20.04 on /dev/sda5
and
Ubuntu 16.04 on a logical volume group.

What is the output of the command

sudo fdisk -l

Disk /dev/loop0: 162.89 MiB, 170778624 bytes, 333552 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 /dev/loop1: 97.6 MiB, 101777408 bytes, 198784 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 /dev/loop2: 97.72 MiB, 102445056 bytes, 200088 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 /dev/loop3: 55.33 MiB, 58007552 bytes, 113296 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 /dev/loop4: 239.10 MiB, 251637760 bytes, 491480 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 /dev/loop5: 9.7 MiB, 9510912 bytes, 18576 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 /dev/loop6: 54.98 MiB, 57626624 bytes, 112552 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 /dev/loop7: 161.102 MiB, 169861120 bytes, 331760 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 /dev/sda: 931.53 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: WDC WD10EZEX-00W
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xdfba0922

Device     Boot   Start        End    Sectors  Size Id Type
/dev/sda1  *       2048    1050623    1048576  512M  b W95 FAT32
/dev/sda2       1052670 1953523711 1952471042  931G  5 Extended
/dev/sda5       1052672 1953523711 1952471040  931G 83 Linux

Partition 2 does not start on physical sector boundary.

Disk /dev/sdb: 223.58 GiB, 240057409536 bytes, 468862128 sectors
Disk model: PNY CS1311 240GB
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x57a1be9f

Device     Boot   Start       End   Sectors   Size Id Type
/dev/sdb1  *       2048    999423    997376   487M 83 Linux
/dev/sdb2       1001470 468860927 467859458 223.1G  5 Extended
/dev/sdb5       1001472 468860927 467859456 223.1G 8e Linux LVM

Disk /dev/mapper/ubuntu--vg-root: 207.17 GiB, 222440718336 bytes, 434454528 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 /dev/mapper/ubuntu--vg-swap_1: 15.9 GiB, 17054040064 bytes, 33308672 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 /dev/loop8: 161.42 MiB, 169254912 bytes, 330576 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 /dev/loop9: 50.69 MiB, 53133312 bytes, 103776 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 /dev/loop10: 217.92 MiB, 228478976 bytes, 446248 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 /dev/loop11: 62.9 MiB, 65105920 bytes, 127160 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 /dev/loop12: 169.31 MiB, 177528832 bytes, 346736 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 /dev/loop13: 163.68 MiB, 171618304 bytes, 335192 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 /dev/loop14: 30.95 MiB, 32432128 bytes, 63344 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 /dev/loop15: 290.45 MiB, 304545792 bytes, 594816 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 /dev/loop16: 255.58 MiB, 267980800 bytes, 523400 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 /dev/loop17: 30.27 MiB, 31735808 bytes, 61984 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 /dev/loop18: 43.16 MiB, 45248512 bytes, 88376 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

On Thursday, October 15, 2020 03:05 EDT, Manfred Hampl <email address hidden> wrote:
 Your question #693467 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/693467

Manfred Hampl posted a new comment:
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 916G 28G 842G 4% /

and

Ubuntu 16.04.6 LTS (16.04) (on /dev/mapper/ubuntu--vg-root)

Apparently there are two separate installations of Ubuntu on your hard disk(s).
Ubuntu 20.04 on /dev/sda5
and
Ubuntu 16.04 on a logical volume group.

What is the output of the command

sudo fdisk -l

-- You received this question notification because you asked the question.

Manfred Hampl (m-hampl) said : #12

My interpretation of your output:

Ubuntu 20.04 is on /dev/sda5 (a partition on the first hard disk) and
Ubuntu 16.04 is on /dev/sdb5 (inside a logical volume group on the second hard disk).

These are two different hard disks.

The easiest way to remove all traces of Ubuntu 16.04 is detaching the second hard disk (and running "sudo update-grub").
The aim of combining the space of Ubutnu 20.04 and 16.04 to one large pool can be acheived only with advanced formatting techniques and will probably require a complete new installation of Ubuntu 20.04.

OK. I suspected as much.  Thanks.

On Thursday, October 15, 2020 08:01 EDT, Manfred Hampl <email address hidden> wrote:
 Your question #693467 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/693467

Manfred Hampl posted a new comment:
My interpretation of your output:

Ubuntu 20.04 is on /dev/sda5 (a partition on the first hard disk) and
Ubuntu 16.04 is on /dev/sdb5 (inside a logical volume group on the second hard disk).

These are two different hard disks.

The easiest way to remove all traces of Ubuntu 16.04 is detaching the second hard disk (and running "sudo update-grub").
The aim of combining the space of Ubutnu 20.04 and 16.04 to one large pool can be acheived only with advanced formatting techniques and will probably require a complete new installation of Ubuntu 20.04.

-- You received this question notification because you asked the question.