Info: Upgrading from Stretch (9) to Buster (10)

[knebb]

Hi,

I was still running my Neuron M103 on Raspbian 9 and I wanted to upgrade now.

As my heating is attached to the Neuron I did not want to have days of troubleshooting. It should be running fine after the upgrade.

So I checked Debian to see what to do for such an upgrade. In short:

• Check package status
• Check additional repositories (like unipi)
• Edit sources.list and files in sources.list.d to match buster
• apt update
• apt upgrade
• apt full-upgrade
• apt autoremove
• reboot

In the end it worked smooth. Some minor issues (there were two mervis symlinks pointing to each other in /etc/nginx/sites-available and /etc/nginx/sites-enabled. Simply deleted them).

I just had one major issue which in the end took me hours to resolve:

The /boot- partition has been only 50M as this was the early default when I installed it initially. The upgrade did fail because of not having enough disk space there. Initially I expected this to be an easy step to increase partition size but it wasn't.

Step-by-step:

• Shutdown my Neuron and removed the SD disk (32G)
• Plugged-in my SD to a Debian computer, there installed as /dev/sda
• Took image backup of both partitions
  dd if=/dev/sda1 of=/srv/neuron.sda1.img
dd if=/dev/sda1 of=/srv/neuron.sda2.img
• Used fdisk /dev/sda to remove the partitions and recreate sda1 with a size of 500M which obviously moved the start of sda2. Created sda2 with a size a little bit smaller than it has been before.
• Formatted /dev/sda1 with mkfs.vfat (had to be installed through apt install dosfstools)
  Note: Simply resizing did not work as fatresize , parted neither Windows are able to handle such small FAT32 partitions. So format from scratch and copy existing files over:
  rsnyc -av /mnt/old.boot/ /mnt/new.boot
• Resize the image of sda2 as it is larger than the new size of sda2 (could have done before on the device, though): e2fsck -f ./neuron.sda2.img; resize2fs ./neuron.sda2.img 20G
• Bring back the smaller image: dd if=neuron.sda2.img of=/dev/sda2
  Note: It complained about "no more space on device" which is expected but does not harm as there is no data on the missing bits.
• Resize the filesystem now to match the (new) partition size:
  resize2fs /dev/sda2
• umount and unplug the SD from Linux, plug it into the Neuron and power on.

Worked fine and once the partition issues have been solved the apt upgrade and apt full-upgrade steps went smooth.

Now my Neuron is running fine on Raspbian 10. I just had to recompile my own application as there was a version mismatch with one of the used libraries.

/KNEBB

[AVsetula]

Hi @knebb,

Thanks for this post, it's very helpful.

Best regards,
Antonin, Unipi