On 13/07/2019 03:03, Martin Gregorie wrote:
> This (Friday) evening I upgraded my RPi 512MB 2?B from Stretch to Buster
> by following the directions on the RaspberryPi.org website for doing the
> Stretch->Buster upgrade in situ. Overall it took about 5.5 hours to
> complete and was fairly straight forward and fairly painless.

I upgraded 8 simultaneously on Friday, and it didn't take that long for
them, except the one in the shed which is right at the limit of WiFi
range and needed a couple of goes at fetching all the packages.

>  every 30-60 minutes the upgrade asked whether it should keep a
>   modified configuration file and waited for an answer, so if you
>   use this way of upgrading, keep an eye on it for these questions
>   so the upgrade doesn't sit waiting for input for too long.

That's a pain, but at least I was driving them from 8 ssh sessions on a
large monitor, so I could see when each needed attention. Note, use the
screen program, so if the comms drops for any reason, you can resume the
same session - otherwise you'll need to fix a broken partial install.

The two main issues for me were:-

1) It seemed to un-configure nginx web server, and in one case reinstall
Apache 2 which I'd removed. I needed to set up the nginx sites-available
default file, and re-run the RPi Camera Web Interface installer, before
my Pi's with cameras started serving again.

2) Bluetooth on the Raspberry Pi 3B is now very unreliable. I use the Pi
3B next to my Bluetooth LE enabled weather station to read its data, and
the stack was getting framing errors after one or two reads, stopping
any further comms until the interface was taken down and back up. I've
found this is a known issue with Buster - it has set too a high a baud
rate on the UART connected to the Bluetooth chip, and the 3B has no
hardware handshaking. Luckily the weather station is in range of my 3B+
which has hardware handshaking on the UART, so seems to have no issues.

So if you use Bluetooth on a 3B, I recommend holding off on the Buster
upgrade until an update lowers the baud rate to what it was under
Stretch, which worked reliably for several years.

---druck

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