Section: User Commands (1)
Updated: 5 June 2016
linux-update-symlinks - maintain symlinks to default kernel and initramfs
is intended to be called from the
postinst and postrm maintainer scripts of Linux kernel packages. The
postinst script must pass the first argument install or
upgrade depending on whether a fresh installation or an upgrade
has taken place.
The VERSION argument must be the kernel version string as shown by
uname -r and used in filenames.
The IMAGE-PATH argument must be the absolute filename of the
By default, this command maintains symlinks in the root directory.
This behaviour can be modified by settings in
Specifies the directory in which to maintain symlinks
If set to a true value, specifies that the directory is /boot
If set to a false value, disables maintenance of symlinks
The symlinks for the primary default kernel version are named
vmlinuz or vmlinux (depending on whether the architecture
normally uses compressed kernel images) and initrd.img (if it
uses an initramfs). The symlinks for the secondary default have the
same names with the suffix .old.
If symlink maintenance is disabled, linux-update-symlinks does
nothing, successfully. Otherwise it makes a list of kernel versions
in decreasing order of priority:
The given VERSION, if the first argument is install
The current primary default version, if it exists and is not already
The current secondary default version, if it exists and is not already
All other versions whose files are installed, excluding the specified
VERSION if the first argument is remove, in decreasing
The top two entries on the list are the new primary and secondary
default versions, and it updates the symlinks accordingly. In case
there is only one entry, this is both the primary and secondary
default version. If there are no entries, there are no default
versions and it removes the default symlinks.
When the first argument is install or upgrade,
linux-update-symlinks assumes that the given VERSION
will use an initramfs unless this variable is set to No.
Installed initramfs images
- /boot/vmlinuz-* | /boot/vmlinux-*
Installed kernel images
Configuration file specifying whether and where to create symlinks
Symlink to the initramfs image for the primary default version
Symlink to the initramfs image for the secondary default version
- /vmlinuz | /vmlinux
Symlink to the kernel image for the primary default version
- /vmlinuz.old | /vmlinux.old
Symlink to the kernel image for the secondary default version
linux-update-symlinks and this manual page were written by Ben
Hutchings as part of the Debian linux-base package.