Ubuntu 18.04升级后无法启动Gnome，进入tty1命令行求助

Hey Peter, sorry to hear you hit this frustrating snag post-upgrade. Let's work through targeted fixes to get your Gnome desktop back up and running—we'll start with the most common causes first:

1. Finish Incomplete Upgrade & Repair Broken Packages #

Even if you ran dpkg already, let's double-down on package repairs to ensure no lingering issues:

• Update package lists and finish any pending upgrades:

  sudo apt update && sudo apt upgrade -y
  

• Fix broken dependencies and incomplete installs:

  sudo apt --fix-broken install
  

• Reconfigure any partially installed packages:

  sudo dpkg --configure -a
  

After running these, reboot with sudo reboot and check if the desktop loads.

2. Reinstall Gnome Desktop Components #

Upgrade glitches often corrupt desktop environment files. Let's fully reinstall the Ubuntu desktop stack:

• Reinstall the core Ubuntu desktop package:

  sudo apt install --reinstall ubuntu-desktop
  

• Ensure critical Gnome components are intact:

  sudo apt install gnome-shell gnome-session gdm3
  

Reboot again to test.

3. Verify & Set the Correct Display Manager #

Ubuntu 18.04 uses gdm3 as the default display manager for Gnome. Sometimes upgrades switch this to another manager (like lightdm) or corrupt its configuration:

• Reconfigure the display manager and select gdm3 when prompted:

  sudo dpkg-reconfigure gdm3
  

Reboot—this should force the system to use the Gnome-compatible display manager.

4. Reset Gnome User Configuration #

Corrupted user-specific Gnome settings can prevent the desktop from loading. Let's back up and reset your config:

• Rename the existing Gnome configuration file (this won't delete your data, just reset desktop settings):

  mv ~/.config/dconf/user ~/.config/dconf/user.bak
  

Reboot, and the system will generate a fresh default configuration.

5. Troubleshoot Graphics Drivers #

Incompatible graphics drivers are a frequent culprit for post-upgrade desktop failures:

• If you're using NVIDIA drivers, purge them first (they often break during upgrades):

  sudo apt purge nvidia*
  

• Install the open-source Nouveau driver as a fallback:

  sudo apt install nouveau-firmware
  

Reboot—if this fixes the issue, you can later reinstall the official NVIDIA drivers once the system is stable.

Try these steps in order, rebooting after each one. Most users resolve this with steps 1-3, but if not, the configuration reset or driver fix usually does the trick.

内容的提问来源于stack exchange，提问作者PeterDz