Ubuntu 먹통되는 문제 조치

문제점

ssh 연결 안됨

모니터 연결시, 화면 연결 안됨

원인 파악

# what went wrong before a reboot. 확인
journalctl -b -1 -p err..alert > ~/previous-boot-errors.log
journalctl -b -1 -p warning > ~/previous-boot-warnings.log

# hardware and boot issues 확인
sudo dmesg > ~/dmesg.log

Graphics Stack Crash (HDMI blank) 조치

 

# 문제
gnome-session: Unrecoverable failure in required component org.gnome.Shell.desktop  
Failed to setup: No GPUs with outputs found  
All outputs disconnected

# GPU 드라이버 재설치
sudo ubuntu-drivers autoinstall

# 조치: Text mode로 전환
sudo systemctl set-default multi-user.target

# Graphic 모드 원복
sudo systemctl set-default graphical.target

Wi-Fi Failure (SSH unreachable) 조치

ath10k_pci: failed to receive initialized event from target  
wmi command timeout

Name Resolution + Connectivity Issues 조치

# 문제
ntpd: error resolving pool *.ubuntu.pool.ntp.org  
systemd-networkd-wait-online: Timeout occurred while waiting for network

# 조치: reboot할때 network 설정을 기다리지 않고 진행 설정
sudo systemctl disable systemd-networkd-wait-online

# 조치: wifi 드라이버 설치
sudo apt install firmware-atheros

Out-of-Memory Daemon Failing 조치

# 문제
systemd-oomd: Event loop failed: Connection refused

# 조치: oomd 재설치
sudo apt install --reinstall systemd-oomd