====== Ubuntu - Boot - Free up space in /boot ======

/boot partition is nearly full; or a warning is received every time the system is rebooted.

Confirm this is the case:

<code bash>
df
ls /boot/
</code>

----

===== Purge unused kernels =====

<code bash>
sudo apt-get purge linux-image-x.x.x-x
</code>

<WRAP info>
**NOTE**:  Removing the linux-image-x.x.x-x package will also remove linux-image-x.x.x-x-generic.
</WRAP>

----

===== Delete source headers  =====

The headers are installed into **/usr/src** and are used when building out-tree kernel modules.

<code bash>
ls /usr/src
</code>

Returns

<code bash>
linux-headers-4.4.0-21          linux-headers-4.4.0-34-generic  linux-headers-4.4.0-42          linux-headers-4.4.0-45-generic
linux-headers-4.4.0-21-generic  linux-headers-4.4.0-36          linux-headers-4.4.0-42-generic  linux-headers-4.4.0-47
linux-headers-4.4.0-31          linux-headers-4.4.0-36-generic  linux-headers-4.4.0-43          linux-headers-4.4.0-47-generic
linux-headers-4.4.0-31-generic  linux-headers-4.4.0-38          linux-headers-4.4.0-43-generic
linux-headers-4.4.0-34          linux-headers-4.4.0-38-generic  linux-headers-4.4.0-45
</code>


Delete unused source headers

<code bash>
rm -Rf /usr/src/linux-headers-4.4.0-21*
</code>

<WRAP alert>
**ALERT**:  Take special care that you have entered the **rm** command correctly to prevent deleting unintended files.
</WRAP>