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--- ubuntu:kernel:delete_old_kernel_images [2019/12/15 22:15] – created peter
+++ ubuntu:kernel:delete_old_kernel_images [2020/07/15 09:30] (current) – external edit 127.0.0.1
@@ Line 40: / Line 40: @@
 The **purge** removes packages and any configuration files are deleted too.
+On newer system all obsolete kernels and headers should automatically be flagged as not being needed, and thus can be purged with the following single command:
+<code bash>
+sudo apt --purge autoremove
+</code>
+returns:
+<code bash>
+Reading package lists... Done
+Building dependency tree
+Reading state information... Done
+The following packages will be REMOVED:
+  linux-headers-3.12.0-27* linux-headers-3.12.0-27-virtual*
+upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
+After this operation, 64.7 MB disk space will be freed.
+Do you want to continue [Y/n]? y
+(Reading database ... 218493 files and directories currently installed.)
+Removing linux-headers-3.12.0-27-virtual ...
+Removing linux-headers-3.12.0-27 ...
+</code>
+----
+===== Delete kernel packages in remove/deinstall state =====
+<code bash>
+sudo dpkg --list | grep linux-image
+</code>
+returns:
+<code bash>
+rc  linux-image-4.15.0-29-generic              4.15.0-29.31                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-55-generic              4.15.0-55.60                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-58-generic              4.15.0-58.64                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-60-generic              4.15.0-60.67                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-62-generic              4.15.0-62.69                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-64-generic              4.15.0-64.73                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-65-generic              4.15.0-65.74                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-66-generic              4.15.0-66.75                                    amd64        Signed kernel image generic
+rc  linux-image-4.15.0-69-generic              4.15.0-69.78                                    amd64        Signed kernel image generic
+ii  linux-image-4.15.0-70-generic              4.15.0-70.79                                    amd64        Signed kernel image generic
+ii  linux-image-4.15.0-72-generic              4.15.0-72.81                                    amd64        Signed kernel image generic
+ii  linux-image-generic                        4.15.0.72.74                                    amd64        Generic Linux kernel image
+</code>
+  * **rc**: means package is in remove/deinstall state and only config file exists.
+  * **ii**: means package is in install state and it is 100% installed on the system.
+----
+==== Remove all linux-image packages in rc state ====
+<code bash>
+sudo x=$(dpkg --list | grep -i linux-image | grep ^rc| awk '{ print $2}')
+sudo echo "$x"
+sudo apt --purge remove $x
+</code>
+----
+==== Recheck kernel package state ====
+<code bash>
+sudo dpkg --list | grep linux-image
+</code>
+returns:
+<code bash>
+ii  linux-image-4.15.0-70-generic              4.15.0-70.79                                    amd64        Signed kernel image generic
+ii  linux-image-4.15.0-72-generic              4.15.0-72.81                                    amd64        Signed kernel image generic
+ii  linux-image-generic                        4.15.0.72.74                                    amd64        Generic Linux kernel image
+</code>
+Note that all **rc** states have gone.
+----
+===== Deleting all old kernels easily =====
+Get a list of kernels.
+<code bash>
+# Get kernel version.
+v="$(uname -r | awk -F '-virtual' '{ print $1}')"
+# Create ignore list to avoid deleting the running kernel.
+i="linux-headers-virtual|linux-image-virtual|linux-headers-${v}|linux-image-$(uname -r)"
+# Display the list.
+echo dpkg --list | egrep -i  'linux-image|linux-headers' | awk '/ii/{ print $2}' | egrep -v "$i"
+</code>
+To delete it simply run it as follows:
+<code bash>
+v="$(uname -r | awk -F '-virtual' '{ print $1}')"
+i="linux-headers-virtual|linux-image-virtual|linux-headers-${v}|linux-image-$(uname -r)"
+apt --purge remove $(dpkg --list | egrep -i  'linux-image|linux-headers' | awk '/ii/{ print $2}' | egrep -v "$i")
+</code>
+----
+===== Easy way to delete all old kernels =====
+<code bash>
+sudo apt-get purge $(dpkg -l linux-{image,headers}-"[0-9]*" | awk '/ii/{print $2}' | grep -ve "$(uname -r | sed -r 's/-[a-]+//')")
+</code>
+----
+===== Simple way to delete all old kernels =====
+<code bash>
+sudo purge-old-kernels
+</code>