Linux systemd services 제거 / OS업그레이드 > Linux/Apm

 systemd services 제거 

systemctl stop [servicename]

systemctl disable [servicename]

rm /etc/systemd/system/[servicename]

rm /etc/systemd/system/[servicename] # and symlinks that might be related

rm /usr/lib/systemd/system/[servicename] 

rm /usr/lib/systemd/system/[servicename] # and symlinks that might be related

systemctl daemon-reload

systemctl reset-failed

 OS업그레이드 

sudo apt-get update

sudo apt-get install update-manager-core

lsb_release -a

uname -a

sudo do-release-upgrade -d

https://www.dell.com/support/kbdoc/ko-kr/000131667/how-do-i-upgrade-my-ubuntu-operating-system-to-the-latest-version