Difference between revisions of "Clean ubuntu"
 
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[[Category:Linux]]
 
[[Category:Linux]]
  
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This page explains how to remove old and un-necessary kernels as well as cleaning the /boot partition.
  
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=Clean /boot=
 
  
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==Manual method==
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=Know the current Kernel version=
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===Kernel version===
 
  
 
Get your current kernel version
 
Get your current kernel version
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''3.13.0-32-generic''
 
''3.13.0-32-generic''
  
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=Installed kernels=
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==List kernels that can be removed==
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The following command will return the list of packages that can be removed:
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<syntaxhighlight lang="bash">
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dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r|sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d'
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</syntaxhighlight>
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 +
Source: Linux pratique no94, FR, mars|avril 2016
  
  
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===Installed kernels===
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==List of all kernels (including current one)==
  
 
Get a list of installed kernels
 
Get a list of installed kernels
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dpkg --list 'linux-image*'
 
dpkg --list 'linux-image*'
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
  
 
You should see something like:
 
You should see something like:
  
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<nowiki>
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{| class="wikitable"
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||/ Name                                       Version                   Architecture               Description
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|-
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+++-===========================================-==========================-==========================-===========================================================
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! / !! Name !! Version !! Architecture !! Description  
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un linux-image                                 <none>                     <none>                     (no description available)
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|-
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un linux-image-3.0                             <none>                     <none>                     (no description available)
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| un || linux-image || <none> || <none> || (no description available)
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rc linux-image-3.13.0-24-generic               3.13.0-24.47               amd64                     Linux kernel image for version 3.13.0 on 64 bit x86 SMP
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|-
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ii linux-image-3.13.0-30-generic               3.13.0-30.55               amd64                     Linux kernel image for version 3.13.0 on 64 bit x86 SMP
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| un || linux-image-3.0 || <none> || <none> || (no description available)
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ii '''linux-image-3.13.0-32-generic'''         3.13.0-32.57               amd64                     Linux kernel image for version 3.13.0 on 64 bit x86 SMP
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|-
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rc linux-image-extra-3.13.0-24-generic         3.13.0-24.47               amd64                     Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
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| rc || linux-image-3.13.0-24-generic || 3.13.0-24.47 || amd64 || Linux kernel image for version 3.13.0 on 64 bit x86 SMP
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ii linux-image-extra-3.13.0-30-generic         3.13.0-30.55               amd64                     Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
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|-
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ii '''linux-image-extra-3.13.0-32-generic'''   3.13.0-32.57               amd64                     Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
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| ii || linux-image-3.13.0-30-generic || 3.13.0-30.55 || amd64 || Linux kernel image for version 3.13.0 on 64 bit x86 SMP
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ii linux-image-generic                         3.13.0.32.38               amd64                     Generic Linux kernel image
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|-
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</nowiki>
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| ii || '''linux-image-3.13.0-32-generic''' || 3.13.0-32.57 || amd64 || Linux kernel image for version 3.13.0 on 64 bit x86 SMP
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|-
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| rc || linux-image-extra-3.13.0-24-generic || 3.13.0-24.47 || amd64 || Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
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|-
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| ii || linux-image-extra-3.13.0-30-generic || 3.13.0-30.55 || amd64 || Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
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|-
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| ii || '''linux-image-extra-3.13.0-32-generic''' || 3.13.0-32.57 || amd64 || Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
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|-
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|ii || linux-image-generic || 3.13.0.32.38 || amd64 || Generic Linux kernel image
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|-
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|}
  
  
  
  
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=Delete kernels=
  
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==Automatic deletion==
  
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<syntaxhighlight lang="bash">
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# list the package to remove
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dpkg -l | awk '{print $2}' | grep -E "linux-(image|headers)-$(uname -r | cut -d- -f1).*" | grep -v $(uname -r | sed -r -e 's:-[a-z]+.*::')
  
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Delete the kernels you don't want/need anymore
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# remove all old kernels at once
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apt-get purge $(dpkg -l | awk '{print $2}' | grep -E "linux-(image|headers)-$(uname -r | cut -d- -f1).*" | grep -v $(uname -r | sed -r -e 's:-[a-z]+.*::'))
  
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<syntaxhighlight lang="bash">
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# update grub
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apt-get remove linux-image-VERSION
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update-grub
 
</syntaxhighlight>
 
</syntaxhighlight>
  
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Replace VERSION with the version of the kernel you want to remove.
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Source: Linux pratique no94, FR, mars|avril 2016
  
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When you're done removing the older kernels, you can run this to remove ever packages you won't need anymore:
 
  
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sudo apt-get autoremove
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==Manual deletion==
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And finally you can run this to update grub kernel list:
 
  
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sudo update-grub
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Delete the kernels you don't want/need anymore
  
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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sudo add-apt-repository ppa:caffeine-developers/ppa
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# Remove old kernels (repeat for each version)
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sudo apt-get update && sudo apt-get install caffeine
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OLD_KRNL_VERSION=4.4.0-21
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apt-get remove --purge linux-headers-${OLD_KRNL_VERSION}* linux-image-${OLD_KRNL_VERSION}* linux-image-extra-${OLD_KRNL_VERSION}*
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# at the end update Grub
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update-grub
 
</syntaxhighlight>
 
</syntaxhighlight>
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 +
set ''OLD_KRNL_VERSION'' to the version of the kernel you want to remove.

Latest revision as of 15:31, 22 May 2016


This page explains how to remove old and un-necessary kernels as well as cleaning the /boot partition.


Know the current Kernel version

Get your current kernel version 

uname -r


You should see something like:

3.13.0-32-generic


Installed kernels

List kernels that can be removed

The following command will return the list of packages that can be removed: 

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

Source: Linux pratique no94, FR, mars|avril 2016


List of all kernels (including current one)

Get a list of installed kernels 

dpkg --list 'linux-image*'


You should see something like:

/ Name Version Architecture Description
un linux-image <none> <none> (no description available)
un linux-image-3.0 <none> <none> (no description available)
rc linux-image-3.13.0-24-generic 3.13.0-24.47 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
ii linux-image-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
ii linux-image-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
rc linux-image-extra-3.13.0-24-generic 3.13.0-24.47 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
ii linux-image-extra-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
ii linux-image-extra-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
ii linux-image-generic 3.13.0.32.38 amd64 Generic Linux kernel image



Delete kernels

Automatic deletion

# list the package to remove
dpkg -l | awk '{print $2}' | grep -E "linux-(image|headers)-$(uname -r | cut -d- -f1).*" | grep -v $(uname -r | sed -r -e 's:-[a-z]+.*::')

# remove all old kernels at once
apt-get purge $(dpkg -l | awk '{print $2}' | grep -E "linux-(image|headers)-$(uname -r | cut -d- -f1).*" | grep -v $(uname -r | sed -r -e 's:-[a-z]+.*::'))

# update grub
update-grub

Source: Linux pratique no94, FR, mars|avril 2016


Manual deletion

Delete the kernels you don't want/need anymore 

# Remove old kernels (repeat for each version)
OLD_KRNL_VERSION=4.4.0-21
apt-get remove --purge linux-headers-${OLD_KRNL_VERSION}* linux-image-${OLD_KRNL_VERSION}* linux-image-extra-${OLD_KRNL_VERSION}*

# at the end update Grub
update-grub

set OLD_KRNL_VERSION to the version of the kernel you want to remove.

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