Ubuntu Notes

update meta data:

sudo apt-get update

sudo apt-get autoclean
sudo apt-get clean
sudo apt-get autoremove

apt-cache search keyword

list stuff that could be upgraded ( analogy: yum check-updates):

apt list --upgradable

apt list --installed

apt-get install --only-upgrade fail2ban

want all , including kernel?

apt-get dist-upgrade  --dry-run

apt list --upgradable 
apt-get install --only-upgrade

debsums

checking the integrity of packages;