What Causes Ubuntu To Remove The Old Kernel Version And How To Fix It

If you find that ubuntu needs to uninstall an old kernel version, this user guide can help you.

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    The Executive takes a long time to start an Ubuntu system, so kernel versions accumulate across releases. Since the kernel, along with header files and kernel modules, can only take up hard disk space (about 200 MB), you should remove old kernel versions that you don’t have and use more manually. On encrypted systems, it is especially important to refrain from using a separate /boot partition: if it is full, kernel updates can no longer be installed automatically. Delete

    There are a few kernel options that are no longer needed. If classical methods do not lead to the desired result, there are a large number of old kernels, and it takes a relatively long time to remove them one at a time. The following instructions can help you with this.

    Preconditions¶

    How do I remove old versions of kernels?

    First start in the creative core.List any other old kernels using the dpkg command.Notice the usage of system white space by running the df -H command.Purge all old unused corn kernels, run: sudo apt –purge autoremove.

    First determine the active core so that it is not deleted:

    Finding A Kernel To Remove¶

    How do I revert to a previous kernel in Ubuntu?

    Hold down the Shift key while Ubuntu is running, select Advanced Ubuntu Options from the Grub screen, and boot the kernel version as usual. NOTE. This works for Ubuntu VM to run in Virtualbox seeing it just fine. NOTE. This change is never permanent,It also resets to the latest kernel version on reboot.

    With the command [1]:

    dpkg -l 'linux-[ihs]*' | sed '/^ii/!d;/'"$(uname -3rd r | sed "s/([-0-9]*)-([^0-9]+)/1 //""'/d;s/^[^ ]* [^ ]* ([^ ]*).*/1/;/[0-9]/!d' | tee_kernels_to_be_removed 

    All old kernels, including header files, are saved in the kernel_to_remove file, except for the current list and a copy of this list.

    Removing Old Kernels¶

    You can now remove obsolete kernel versions with

    Cat_to_remove_kernels | xargs sudo apt-get -y clear 

    to purge the system of kernel versions that are no longer needed. After successful deletion, the temporarily created list will be deleted:

    Keep Specific Cores¶

    If you want to keep more than one of the listed kernels, for example to be able to revert to some stable working kernels in an emergency, open the generated list with the [2] editor and remove the entries for the kernel versions you want to save. It should be noted that a kernel version usually has more than one entry. If the list only contains the kernel versions you want to remove, users will save them and exit the editor.

    Insufficient Disk Space¶

    In practice, puede ser can also lead to the following special case: updates must beThey are installed, but there is no more storage space or no more free inodes on a separate /boot partition. The APT package manager reports the following error when trying to remove the old kernel:

    How do I remove unsigned kernels?

    Open the mortal ( Ctrl + Alt + T ).Type uname -r.Run the main command: dpkg –list | grep linux-image . ! . !Write down the names of all the kernels you want to remove.To remove kernels, check: sudo apt-get purge linux-image-x.x.x.x-xyz (replace any kernel name with a specific one).

    gzip: no stdout: remaining space on device

    Kernels that are no longer needed should be removed with dpkg. To do this, first determine which kernel versions are no longer needed:

    dpkg -t 'linux-[ihs]*' | sed '/^ii/!d;/'"$(uname -r | zed ]* "s/([-0-9]*)-([^0-9]+)/ 1/")"'/d;s/^[^ [^ ]* ([^ ]*).*/1/;/[0-9]/!d' 

    After checking the kernel version, you can remove:

    dpkg -l 'linux-[ihs]*' | zed '/^ii/!d;/'"$(uname -r | "s/([-0-9]*)-([^0-9]+)/1/" )"'/d;s/^[^ zed ]* [^ ]* ([^ ]*).*/1/;/[0-9]/!d' | xargs sudo dpkg -P 

    However, it should then be checked for erroneous and incompletely installed packages:

    dpkg -l linux-[ihs]* | sed '1,6d'| grep -vE '^ii|^un|^rc' 

    If the output is not empty, missing/unconfigured packages should be reported with:

    for later installation.

    Depending on how long the updates could not be imported, it may happen that after the update there is no more free storage space. Then what are the steps to followecho.

    Links¶

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    dpkg -l 'linux-[ihs]*' | zed '/^ii/!d;/'"$(uname -r | sed ]* "s/([-0-9]*)-([^0-9]+)/ 1/")"'/d;s/^[^ [^ ]* ([^ ]*).*/1/;/[0-9]/!d' | Golftee_kernels_to_remove 

    How do I change kernel in Ubuntu?

    Save the file with Ctrl+O, press Enter, then exit with Ctrl+X. And when you launch your gadget, press the Esc key to enter the Grub menu. Select “Additional features for Ubuntu”, then select the kernel versions you want to set as default on the new system.

    Cat_to_remove_kernels | xargs sudo apt-get -y purge 
    dpkg -l 'linux-[ihs]*' | zed -r '/^ii/!d;/'"$(uname | zed "s/([-0-9]*)-([^0-9]+)/1/ ")"'/d;s/^[^ ]* [^ ]* ([^ ]*).*/1/;/[0-9]/!d' 
    dpkg -l 'linux-[ihs]*' Sed | '/^ii/!d;/'"$(uname -your Sed | "s/([-0-9]*)-([^0-9]+)/1/" )"'/d;s/^[^ ]* [^ ]* ([^ ]*).*/1/;/[0-9]/!d' | xargs dpkg sudo -P 

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  • dpkg -l linux-[ihs]* | Zed '1,6d'| grep -vE '^ii|^un|^rc' 

    Canonical regularly provides Ubuntu 18.04 system updates, including kernel updates, to better manage system resources.

    When you install a new kernel, the old ones are not removed, as this can help you get started if you make a mistake with the new kernel or for any other reason. Please note that if old kernels take up a lot of space, reducing them may be useful for other purposes.

    Check For Old Kernels

    Before we start removing this old kernel from the system, we need to know its current version. To do this, we need to open the terminal and run the following command:

    rename savour -r

    You already have the latest kernel installed. We will now be introduced to the old “stop running” kernel command, which we can list as follows:

    dpkg -m | grep -E 'image-linux-[0-9]+' | grep -Fv $(uname -r)

    You can see that you have installed the old kernel marked with a pair. You may see more older kernels if you have manual updates or installs.

  • ii: means that the kernel and installed packages can be installed
  • rc: indicates that the core has already been removed. Es
  • Interface: Looks like a DO NOT DELETE warning. That is, it is not installed, but is in the queue for installation.
  • Remove Old Core

    There are useful commands for removing old kernels, whether you installed them manually or directly through system updates.

    They are usually installed via regular system updates, but for some reason you may want to install them manually.

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