1. It is not uncommon for Windows and Ubuntu dual systems to shut down slowly. Sometimes this phenomenon occurs in Linux mint or Ubuntu under a single system. The main reason is that there are still processes that have not been closed or software compatibility reasons, so there is a 90 -second waiting time for each shutdown, so users feel that the shutdown is slow.
2. Solution:
a. Open the terminal and enter sudo apt-get install watchdog
b. Configure watchdog , enter sudo enable watchdog.service
c. Open watchdog , enter sudo start watchdog.service
Watchdog related
https://baike.baidu.com/item/watchdog/5403686?fr=aladdin
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