install mysql in debian 9

om flag

I need to install MySQL 7.5 on Debian 9 stretch, I tried to download it using PPA but when I try to update and complete download I get error apt-key expire.

Err:2 stretch InRelease
  The following signatures were invalid: EXPKEYSIG 8C718D3B5072E1F5 MySQL Release Engineering 
Hit:4 stretch InRelease

I tried to del the key and re-add it but still the same issue. how can I fix this issue, any help please!.

sos5020 avatar
om flag
I wasted a lot of time trying all possible solutions but to no avail.
jp flag
Please notice that the LTS support for Debian 9 will end on 2022-06-30. It might be time to upgrade to Debian 11.
sos5020 avatar
om flag
I have sup system that required Debian 9

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