Chromium 系列浏览器运行报错：The profile appears to be in use by another Chromium process
在 Ubuntu 平台下，修改了主机名之后，再次运行 Chrome 时报错：
The profile appears to be in use by another Google Chrome process (8879) on another computer ("previous name of the computer"). Chrome has locked the profile so that it doesn't get corrupted. If you are sure no other processes are using this profile, you can unlock the profile and relaunch Chrome.
若是直接通过正常安装的，删除配置目录下的文件即可。
rm -rf ~/.config/google-chrome/Singleton*
但是，我使用的是 flatpak，所以，对应的目录在：
~/.var/app/google-chrome/config/chromium/Singleton*