Quick Reference

  • Check IP address ifconfig -a
  • Run commands quickly with Alt + F2
  • Mount disk udisksctl mount --block-device /dev/disk/by-uuid/<uuid>
  • View startup applications - gnome-session-properties
  • Closing a port sudo ss --kill state listening src :1234
  • Making files executable sudo chmod +x filename

Fixing Temporary Failure in Name Resolution

sudo chmod o+r /etc/resolv.conf
sudo nano /etc/resolv.conf

Replace the nameserver with Google DNS 8.8.8.8 Save file Crtl + X

Freeing ports in Use

lsof -i:8080
kill <PROCESSID>
# or
kill $(lsof -t -i:8080)

Fixing garbeled Audio

Uninstall speech dispatcher

sudo apt remove speech-dispatcher

pulseaudio --check 
# should exit with no message if running
pulseaudio --k
pulseaudio --start
pulseaudio --check

Installing .AppImage Files

Eg: if the AppImage file name was Obsidian-0.12.3

chmod a+x Obsidian-0.12.3.AppImage
./Obsidian-0.12.3.AppImage

Installing .deb Files

sudo apt install ./zoom\_amd64.deb OR sudo dpkg -i package\_file.deb

Uninstalling

sudo apt-get remove packageName
dpkg --remove packageName

Installing via CMake

./configure
make
make install

Unzip files

Tar

tar xvzf PACKAGE.tar.gz tar -xf package.tar.gz

RAR

unrar e <filename>

Mounting drives

# unmounting
umount /dev/sdb1
# mounting
sudo mount /dev/sdb1 -t ntfs-3g -o permissions /media/pulasthi/Files/
# setting permissions for all
sudo chmod ugo+wx /media/pulasthi/Files/

ledev14 us-east-2

Tracing Packet path

Use traceroute. sudo apt install traceroute Using dig sudo apt-get install dnsutils https://phoenixnap.com/kb/linux-dig-command-examples

Switching JAVA versions

sudo update-alternatives --config java
# exporting java home
export JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-amd64"

Getting the Fingerprint sensor to work

https://askubuntu.com/questions/1239134/fingerprint-sensor-not-working-ubuntu-20-04

Cycle swap memory

sudo swapoff -a; sudo swapon -a

Start Chrome without CORS

google-chrome --disable-site-isolation-trials --disable-web-security --user-data-dir="~/tmp"

Reduce external monitor brightness

xrandr -q | grep " connected"
xrandr --output HDMI-A-0 --brightness 0.5