decryption failed: Bad session key

[Frank Hrebabetzky]

Hi all,

I have 2 encrypted files on my PC, let's call them A and B. Every now 
and then, they are decrypted, edited and encrypted again with the -c 
option. This has been working very well for decades, surviving several 
changes of PCs and Linux flavours. The problem arose after my update 
from	Linux Mint 17 (Ubuntu 14)
to	Linux Mint 19 (Ubuntu 18)

Since then, A wasn't re-encrypted, and I can decrypt it as before. B 
however was re-encrypted, and now I cannot decrypt it anymore. Each 
attempt is responded with

gpg: AES256 encrypted data
gpg: encrypted with 1 passphrase
gpg: decryption failed: Bad session key

Regards,
-- 
Frank Hrebabetzky		+49 / 9261 / 950 0565