spyesx · May 2, 2025 12:23 · Sep 11, 2022 · Jun 30, 2022 · Jun 30, 2022
diff --git a/readme.md b/readme.md
@@ -70,6 +70,18 @@ dpkg -L $package
 dpkg -S $file
 ```
 
+Find heavy files in `/boot/firmware`:
+
+```bash
+find /boot/firmware -size +8M -exec ls -lgd {} \;
+```
+
+Sometime you will find some `*.bak` files. If everything works well, then remove them.
+
+```bash
+rm -rf /boot/firmware/*.bak
+```
+
 Best, do not install Ubuntu on a RPi. This is a bad distribution.
 
 ## More documentation

diff --git a/readme.md b/readme.md
@@ -70,6 +70,8 @@ dpkg -L $package
 dpkg -S $file
 ```
 
+Best, do not install Ubuntu on a RPi. This is a bad distribution.
+
 ## More documentation
 
 Dive into Ubuntu community documentation to [remove old kernel](https://help.ubuntu.com/community/RemoveOldKernels)
diff --git a/readme.md b/readme.md
@@ -0,0 +1,75 @@
+# Remove old linux kernels
+
+## Script way
+
+```bash
+# Dry run to check
+bash remove-old-kernels.sh
+
+# Run
+bash remove-old-kernels.sh exec
+```
+
+## Debian way
+
+```bash
+# Which kernel are you using?
+uname -r
+
+# Which kernels are installed ?
+dpkg --list | egrep 'linux-image|linux-headers'
+```
+
+- `ii` – indicates packages that are currently installed
+- `iU` – package has been unpacked and will be used next reboot
+- `rc` – package already removed, but the configuration files are still present
+
+`autoremove` alone remove older kernels only, but any package that is not needed as a dependency of other packages along with its configuration files.
+
+```bash
+# Will autoremove every packages that qualify for it
+apt-get autoremove --purge
+
+# Remove all configuration files that are still present despite the removed package
+dpkg --list | egrep 'linux-image|linux-headers' | grep rc | awk '{print $2}' | xargs apt purge -y
+
+# Remove and purge one particular package
+# Be careful not to remove your current kernel !
+yes | apt purge "linux-image-XXXXX"
+```
+
+`autoremove` will only remove packages that are automatically installed. If you ever updated or added a kernel package manually autoremove will not remove it. If you ever "held" a kernel version autoremove will not remove it. If you're wondering why Ubuntu is filling up your boot partition with kernels you no longer use it's likely one of these two reasons.
+
+```bash
+# Unhold all packages
+dpkg --get-selections | grep hold | awk '{ print $1, "install" }' | dpkg --set-selections
+
+# Mark all "manually installed" kernel packages as "automatically installed"
+for f in $(apt-mark showmanual | grep linux-); do
+    apt-mark auto $f
+done
+
+# Remove all packages that are no longer needed
+apt-get -y autoremove --purge
+```
+## Raspberry Pi
+
+`/boot/firmware` could get full after an Ubuntu (for RPi) upgrade. Solution above still apply but there is also `linux-firmware-*` to consider.
+
+```bash
+# list "firmware" packages
+dpkg --list | grep "firmware"
+```
+
+```bash
+# Show where files are installed. To confirm they are well in /boot/firmware
+package=linux-firmware-raspi
+dpkg -L $package
+
+# or to see which $file belongs to wich package (could be a long execution time)
+dpkg -S $file
+```
+
+## More documentation
+
+Dive into Ubuntu community documentation to [remove old kernel](https://help.ubuntu.com/community/RemoveOldKernels)
diff --git a/remove-old-kernels.sh b/remove-old-kernels.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+# Run this script without any param for a dry run
+# Run the script with root and with exec param for removing old kernels after checking
+# the list printed in the dry run
+# From: 
+
+uname -a
+IN_USE=$(uname -a | awk '{ print $3 }')
+echo "Your in use kernel is $IN_USE"
+
+OLD_KERNELS=$(
+    dpkg --list |
+        grep -v "$IN_USE" |
+        grep -Ei 'linux-image|linux-headers|linux-modules' |
+        awk '{ print $2 }'
+)
+echo "Old Kernels to be removed:"
+echo "$OLD_KERNELS"
+
+if [ "$1" == "exec" ]; then
+    for PACKAGE in $OLD_KERNELS; do
+        yes | apt purge "$PACKAGE"
+    done
+fi