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rpi frozen shutdown keys

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I recently downloaded latest buster image and it is working fine. However when I run sudo apt-get upgrade I’m getting and error when it is upgrading realvnc with the following message:

new realvnc-vnc-server package post-removal script subprocess returned error exit status 1

The pi seems completely frozen mouse and keyboard doesn’t work, time not updating. Best way to proceed and what is causing this error? Alt+PrintScreen + R E I S U B okay to force shut down?

  • (1) Your “recently” downloaded buster should be July10 or later. I once downloaded a buster Jun28 version and found apt-get update/upgrade problem. Problem disappeared when I used the July10 buster. (2) If the Rpi freezes, then I don’t know what terminal commands to reboot or shutdown. You might like to add the Rpi 3 hardware reset jumper, or Rpi4 Run/GlobalEnalbe jumpers to do manual shutdown. This is to avoid Rpi SD card corrupted because of shutting down during a SD card write operation. Another method is to install a watchdog timer, so that Rpi reboots itself after, say two minutes. – tlfong01 1 hour ago   
  • I used the following commands to install realvnc-vnc-server and found no problems: (1) sudo apt-get update (2) sudo apt-get upgrade (3) sudo apt-get dist-upgrade (4) sudo apt install realvnc-vnc-server (5) sudo apt autoremove. (a) I am using Rpi4B buster July10 sd Card 16GB C10. – tlfong01 6 mins ago    
  • I also found your suggestion can reboot: Alt + <print screen> + R E I S U B. (1) How to shut down Rpi when frozen 2017mar08 raspberrypi.org/forums/viewtopic.php?t=176612#p1126208, (2) Magic SysRq Key Wikipediaen.wikipedia.org/wiki/Magic_SysRq_key – tlfong01 15 secs ago   Edit   

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