Thanks, I upgraded and it works now.
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                    enter link description here does this help? It seems to work – Cat's Meow Oct 27 '21 at 12:20
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            The "short answer" - which often resolves the issue - is to use apt instead of apt-get. If you're interested in further details, please see this answer, and/or this answer.
FWIW, the same situation occurred during the RPi OS upgrade to buster in 2019. Here's another solution that was discovered then that retains use of apt-get - it may still be useful for this upgrade to bullseye.
 
    
    
        Seamus
        
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