How did I fix «key 8C718D3B5072E1F5» / «duplicate signatures removed» / «unchanged: 1» on Debian 10 (Buster)?

MySQL
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1 
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 8C718D3B5072E1F5

2023-08-07--06-03-55
2023-08-07--06-03-551253×142 6.74 KB

2

The solution is the same as for «The detected system (debian jessie) is not supported by MySQL».