polkit 這個是什么服務？
參考網站
https://wiki.archlinux.org/index.php/Polkit_(%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87)
https://www.freedesktop.org/software/polkit/docs/latest/polkit.8.html
大概知道
polkit是linux服務器上的身份認證組件，目的是讓用戶證明自己屬於某個用戶組。更詳細的內容，可以參考上面的網址。
經過百度，找到解決方法
PolicyKit failing to start with error: polkit.service: main process exited, code=exited, status=1/FAILURE
1.Ensure the existence of a polkitd system user & group
Copy/paste the following 2 compound-commands to a root terminal to check for and conditionally create the user/group
getent group polkitd >/dev/null && echo -e "\e[1;32mpolkitd group already exists\e[0m" || { groupadd -r polkitd && echo -e "\e[1;33mAdded missing polkitd group\e[0m" || echo -e "\e[1;31mAdding polkitd group FAILED\e[0m"; } getent passwd polkitd >/dev/null && echo -e "\e[1;32mpolkitd user already exists\e[0m" || { useradd -r -g polkitd -d / -s /sbin/nologin -c "User for polkitd" polkitd && echo -e "\e[1;33mAdded missing polkitd user\e[0m" || echo -e "\e[1;31mAdding polkitd user FAILED\e[0m"; }
2.Reset the permissions and user/group ownership for all files provided by the polkit and polkit-pkla-compat packages
Copy/paste the following compound-command to a root terminal to check for and conditionally reset user/group perms & ownership
rpm -Va polkit\* && echo -e "\e[1;32mpolkit* rpm verification passed\e[0m" || { echo -e "\e[1;33mResetting polkit* rpm user/group ownership & perms\e[0m"; rpm --setugids polkit polkit-pkla-compat; rpm --setperms polkit polkit-pkla-compat; }
3.Reboot
A reboot of the machine will be required to make sure that all changes take affect and that polkit has reconnected to the dbus
shutdown -r now