Ubuntu 20.04频繁卡死且键鼠无响应问题求助

Hey bhavesh, sorry to hear you're stuck with this annoying system freeze issue—nothing's worse than having your work interrupted out of nowhere! Let's go through some practical troubleshooting steps based on the journalctl -r logs you mentioned (from around 9:30 AM when the freeze happened):

• First, dig into the critical errors in your logs:
  • Keep an eye out for OOM killer entries. If your system runs out of memory, it'll trigger the Out-of-Memory killer to terminate processes, which can lead to full system lockups. Run free -h to check your daily memory usage, or install htop to monitor which processes are hogging RAM in real time.
  • Look for GPU driver-related errors (like nvidia or amdgpu messages if you have dedicated graphics). Driver glitches are a common cause of freezes:
    • For NVIDIA GPUs: Purge existing drivers with sudo apt purge nvidia*, then let Ubuntu auto-install the right version with sudo ubuntu-drivers autoinstall
    • For AMD GPUs: Reinstall the open-source driver with sudo apt install xserver-xorg-video-amdgpu
  • Check for disk I/O errors (look for I/O error in logs). This could point to a failing hard drive or filesystem corruption. Use smartctl -a /dev/sda (replace /dev/sda with your actual disk device) to check drive health, and run fsck on your root partition—just make sure to do this from a live USB or single-user mode to avoid damaging mounted filesystems.
• Update your system fully: Outdated kernels or packages often cause compatibility bugs. Run these commands to get everything up to date, then reboot:

  sudo apt update && sudo apt upgrade -y
  

• Try switching kernels: If the latest kernel is causing issues, reboot your system, open the GRUB menu (hold Shift during boot), select "Advanced options for Ubuntu", and boot into an older kernel version. See if the freezes stop happening.
• Rule out hardware issues: Swap your keyboard/mouse to different USB ports, or test with another set of peripherals to make sure the problem isn't with the hardware itself.
• Trim down startup services: Too many background processes can drain system resources. List enabled services with systemctl list-unit-files --type=service --state=enabled, then disable any you don't need with sudo systemctl disable <service-name> (be careful not to disable essential system services!).

If none of these steps fix the issue, sharing the specific log snippet from around 9:30 AM would help us pinpoint the exact cause—feel free to paste that here!

备注：内容来源于stack exchange，提问作者bhavesh kunbi