Useful commands

ubuntu.sh

## Disk management

# how big is your apt cache:
du -sh /var/cache/apt/archives

# remove old kernels (if no longer required)
sudo apt-get autoremove --purge

# list all directories and sort by size
du -m --max-depth 1 | sort -rn

## Firewall
# open port for TCP and UDP packets
sudo ufw allow 19001

## Devices & Power Mangement
# Ubuntu wakes up immediately after suspend
# find out devices in awake state
acpitool -w

# You might see output like the following:
# Device   S-state   Status   Sysfs node
# ---------------------------------------
# 1. P0P1     S4    *disabled
# 2. GLAN     S4    *disabled
# 3. XHC      S4    *enabled

# To disable ‘XHC’, do:
echo 'XHC' > /proc/acpi/wakeup

#Typical suspects are USB devices. To find out the USB devices in your system, do:
lspci | grep USB