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   druck  writes:   
   > I don't know if anyone has a working cross-grade for Raspbian then,   
      
   I have done crossgrades with Debian (x86->amd64) and while it worked[1],   
   I can’t really recommend it unless you are very confident indeed. I’d   
   expect a similar situation with Raspbian/RPi OS.   
      
   [1] meaning I have a working system that’s been continously upgraded   
       since the mid 1990s:   
      
       $ ls -l /etc/hostname   
       -rw-r--r-- 1 root root 6 Mar 24  1995 /etc/hostname   
       $ cat /etc/debian_version   
       12.4   
       $ uname -r   
       6.1.0-16-amd64   
      
   > so I created a new partition with a clean 64 bit Bullseye on it,   
   > installed all the same optional packages as the 32 bit partition, then   
   > copied over all /home, /opt, bits of /var and lastly looked at   
   > /etc. That was the trickiest bit, machine-id and ssh/ssh_host* were   
   > copied across to preserve the identity, but all the other files had to   
   > be diffed and changes integrated so as to keep the legit configuration   
   > and to shed some of the cruft from multiple previous OS releases.   
      
   Makes me wonder how practical it would be to automate this: a tool which   
   captured the configuration of one host (list of packages, configuration   
   that’s been customized relative to installed versions, extra state in   
   /var, etc) and modified a second host to match. I suspect doing it   
   properly would be more work than is worthwhile (architecture transitions   
   just don’t happen very often) but that doesn’t always stop people l-)   
      
   --   
   https://www.greenend.org.uk/rjk/   
      
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