Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 8778 (unattended-upgr)

#서비스 정지 
sudo systemctl stop unattended-upgrades

#자동 재시작 방지 
sudo systemctl disable unattended-upgrades

#프로세스 종료 
sudo kill -TERM <PID>
sleep 5
sudo kill -KILL <PID> 2>/dev/null || true

#dpkg 상태 복구 
sudo dpkg --configure -a

#apt 타이머도 종료 
sudo systemctl stop apt-daily.service apt-daily-upgrade.service
sudo systemctl stop apt-daily.timer apt-daily-upgrade.timer

sudo systemctl disable apt-daily.service apt-daily-upgrade.service
sudo systemctl disable apt-daily.timer apt-daily-upgrade.timer