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Thread: Partitioning

  1. #1
    Join Date
    Oct 2020


    Ubuntu 20.04.1 LTS

    Here's the fdisk -l output:

    Disk /dev/sda: 298.9 GiB, 320072933376 bytes, 625142448 sectors
    Disk model: WDC WD3200BEVT-6
    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: 0xed9293e1

    Device Boot Start End Sectors Size Id Type
    /dev/sda1 * 2048 468685278 468683231 223.5G 83 Linux
    /dev/sda2 468686848 469735423 1048576 512M b W95 FAT32
    /dev/sda3 469737470 625141759 155404290 74.1G 5 Extended
    /dev/sda5 469737472 625141759 155404288 74.1G 83 Linux

    I created an additional partition for a second version of ubuntu. I had a 20.04 fresh install (default boot) on the new plus an earlier 18.04.

    I now want to go back to whatever the default settings were. I don't know which partition has which version so which one to delete, then resize the other?

    As I now just want a single 20.04 OS I don't care if I start completely fresh, can the installation from USB sort out the partitions? I've no idea if the above fdisk output is normal. Just read How to correctly partition ubuntu which says sda/1 doesn't need to be more that 100Mb, not my 223.5Gb?

    If you need to know why I did the above it's because an update to 18.04 in early September killed my wireless mouse, touchpad and keyboard. I created the 20.04 partition to test out some suggested cures, none worked. An update today has now sorted that problem.


  2. #2
    Join Date
    Oct 2009

    Re: Partitioning

    Don't count on sda(x). The 100MB partition they talking about is your sda2(512MB) which okay and does not need changing. If installing 20.04, the easiest way would be to use erase disk and install option. No worries except data would be lost. Will install Ubuntu using the whole disk. Backup all data before doing this, if wanting to save any.

  3. #3
    Join Date
    May 2008
    Ubuntu 20.04 Focal Fossa

    Re: Partitioning

    Quote Originally Posted by tqtim View Post
    As I now just want a single 20.04 OS I don't care if I start completely fresh, can the installation from USB sort out the partitions?
    I think that you have already answered your own question.

    Back up your data.
    Prepare your USB device.
    Boot in UEFI mode.
    Let the Ubuntu installer automatically organise the partitions.
    Reboot and check that you are satisfied.
    Restore your data when ready.

    Happy days.

  4. #4
    Join Date
    Mar 2010
    Ubuntu Mate 16.04 Xenial Xerus

    Re: Partitioning

    If you boot into either Ubuntu and run this command, you'll be able to tell which OS is using which partition:

    df -hT -x squashfs -x tmpfs -x devtmpfs
    Most of that command is to hide fake-storage.
    So, if you know which OS release (18.04 or 20.04) you are running, then that partition will be mounted on /
    The other one will be for the other OS and probably won't be mounted - but it might. If it is, you can go look at the /etc/lsb-release file to see which OS it is. Of course, that lsb-release file will be relative to the other mounted storage.

  5. #5
    Join Date
    Oct 2020

    Re: Partitioning

    Thanks, all sorted now.


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