One liner to stop / remove all of Docker containers:

One liner to stop / remove all of Docker containers:

docker stop $(docker ps -a -q)
docker rm $(docker ps -a -q)

Package Manager & Update Manager problems

Some time when you do "apt-get update"  you get error of key missing, you can solve it by  adding the key
eg
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CBCB082A1BB943DB


sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys MISSINFKEYTYPEEHERE