Ubuntu系统显示异常：终端变白、图标黑白化的恢复求助

Hey Sarah, sorry to hear you're stuck with this annoying display glitch—let's walk through some fixes to get your Ubuntu back to its original look, step by step!

1. 先试试重置GNOME Shell配置（最快速的通用修复） #

Since most Ubuntu desktops use GNOME by default, resetting its core configuration often fixes weird theme-related issues like this:

• Open your terminal (even if it's white, you can still use it—press Ctrl+Alt+T to launch it)
• Run this command to reset all GNOME settings to their factory defaults:

  dconf reset -f /org/gnome/
  

• Press Alt+F2, type r and hit Enter—this will restart the GNOME Shell without needing a full system reboot.

Check if your terminal color and icon appearance are back to normal after this!

2. 删除损坏的主题缓存与配置文件 #

If the first fix doesn't work, it's possible your user-specific theme files got corrupted. Let's clean those up:

• In the terminal, run these commands to delete cached theme data and GTK configuration:

  rm -rf ~/.config/gtk-3.0/ ~/.cache/themes/
  

• Log out of your user account and log back in (or do a full system reboot for good measure)

3. 检查并恢复默认系统主题 #

Sometimes accidental theme changes can cause this issue. Let's verify your system's appearance settings:

• Open Settings (click the top-right system menu, then the gear icon)
• Go to Appearance
• Under the Style section, make sure you've selected the default Yaru theme (it's Ubuntu's out-of-the-box theme)
• For the terminal specifically: Open your terminal, go to Preferences (right-click inside the terminal window > Preferences), switch to the Colors tab, and select the default Ubuntu color scheme from the dropdown.

4. 排查高对比度模式 #

A common mistake is accidentally enabling high contrast mode, which forces icons to be black-and-white and can mess with terminal colors:

• Open Settings > Accessibility
• Scroll down to the Vision section, and make sure the High Contrast toggle is turned off.

If none of these steps work, feel free to leave a comment with more details (like your Ubuntu version, desktop environment) and we can dig deeper!

备注：内容来源于stack exchange，提问作者Sarah Rama