Should the headline marked with [Solved]?

Active 7 days ago
Viewed 46 times

Here I had a discussion about to mark the headline with the tag [Solved]: Rpi4B Raspbian 10 buster Adafruit-blinka Installation Problem [Solved]. I remember that one of the moderator has written for some time in an other comment anywhere not to do this, instead accept the answer. But I cannot find it anymore. So I looked for a policy to this in the Help Center but couldn’t find anything about this. Also searching here on metha I cannot find relevant matches.

So my question: is there a policy how to handle marking headlines with [Solved]? How should this be handled?


  • 2
    I recently posted a comment to that end (including the request to the OP to post an answer as an actual answer instead of an edit to the question). That comment was deleted after the OP changed both. The policy – network-wide as Aurora’s answer states – still stands. Thanks for bringing it up and for creating this meta-post to point out the issue here… (for those cases that future users search for it). – Ghanima Jul 28 at 22:41

2 Answers


It doesn’t look like there’s a specific question on Raspberry Pi Meta, but there’s a question on Meta Stack Exchange, the network-wide meta site, which answers this. As stated in ChrisF’s answer there:

You’re right, putting “[SOLVED]” in the title is not the right thing to do.

If the OP made the edit then leave a comment explaining the correct behaviour – i.e. post the solution as an answer.

If someone else made the edit then roll back the edit and leave a comment addressed at the editor explaining the right thing to do.

While it is customary on some forums to do this, no Stack Exchange site encourages adding [SOLVED] to the title — just accept an answer, and the interface will show the question to be solved:

Accepted answer

Image from Meta Stack Exchange.

  • 2
    Thanks for posting an answer, saves me the effort… and – as is customary – +1 for hand-drawn circle. – Ghanima Jul 28 at 22:38


It could be useful to put “[solved]” into the question title if you’re about to post a self-answer afterwards. That saves the effort of people trying to answer the question before the self-answer is posted.

Once the self-answer is there, one could remove the “[solved]” tag to make the question look normal.

Active 5 days ago
Viewed 70 times

I read MagPi 84 Aug 2019 page 44 Melissa LeBlanc_Williams’s article on using Rpi4 circuitPython to control a robot using two boards:

(1) BNO055 9-Degrees-of-Freedom (DOF) Absolute Orientation Module, and

(2) PCA9685 16-Channel 12-bit PWM/Servo Driver Module.

I followed the instructions to install python3, setup tools, adafruit-blinka library. I got stuck at Step 8:

pip3 install adafruit-blinka

The error message was:

cannot find version that satisfies the requirement, … no matching distro found for adafruit-blinka

My configuration is Rpi4B 2GB Raspbian 10 buster.

Any help or tip appreciated.

Update 2019jul27hkt1629

@milliways’ Rpi4B buster works OK. I am not sure if the reason is that my kernel is too old. I need to update my kernel and tried again.

I checked that my raspbian release date was 2019jun20. The latest release is 2019jul10. I guessed beside the kernel, there might be other packages or drivers out of date. I might have also installed other conflicting software when I played with other things earlier. So I guessed the cleanest solution is to start everything from scratch: download the latest raspbian, and first thing first is to install Adafruit circuit python blinka.

So I installed Raspbian (buster 2019jul10) again. The welcome screen says the release page is not ready, until some 20 days later. I guess this might cause trouble. So I exit GUI desktop straight away and start installing circuit python blinka in terminal mode.

This time everything went smoothly. My conclusion that the root cause of my installation problem is that my Raspbian dated 2019jun20 is out of date. I might also installed other packages earlier and they crash with circuit python’s blinka library.

Anyway, problem solved.

  • 1
    We do not mark the headline [Solved]. This is shown by accepting an answer. – Ingo Jul 27 at 15:47
  • Well, some forums advise to mark the question solved, for the following reasons: (1) Future readers won’t waste time reading questions without answer, (2) Future readers who would like to learn something from the topic. Some forums recommends/encourage to mark the question solved. Some forums auto mark question solved when accepted. Some forums even has “best” answer option, or place answer with most upvotes at top. “How do mark my own Topic as SOLVED?” Thread starterKreelor Start date Apr 21, 2010: forums.tomshardware.com/threads/…. – tlfong01 Jul 28 at 1:28   
  • Actually I did both. I FIRST accepted the answer, with an extra up vote, BEFORE I marked the question solved. I always wish I can rate the answer with points, say 5 out of 10. I also wish to mark some answers as “out dated”, or “only for jessie, not stretch” etc (That is why I “marked” my question “for Rpi4 only”). When I was a Rpi newbie a couple of years ago, I actually wasted a lot of time reading and trying out outdated answers. – tlfong01 Jul 28 at 1:37    
  • You told me how other sites handle this but that’s not Raspberry Pi. As far as I know it was said anywhere that we should not mark the headline [Solved] so I have searched for a policy in the Help Center without success. Let’s discuss it on meta. – Ingo Jul 28 at 9:41
  • @Ingo, OK, let us discuss on meta later. – tlfong01 Jul 28 at 9:46   
  • Please don’t use “solved” tags. That’s not how Stackexchange works. Thanks. – Ghanima Jul 28 at 22:37
  • @Ghanima, Thanks a lot for your advice. So I will removed it. Cheers. – tlfong01 Jul 29 at 0:43   


Works here:-

 sudo pip3 install adafruit-blinka
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting adafruit-blinka
  Downloading https://www.piwheels.org/simple/adafruit-blinka/Adafruit_Blinka-2.2.0-py3-none-any.whl (79kB)
    100% |################################| 81kB 123kB/s 


- Original Installation
Raspberry Pi reference 2019-06-20
- Current OS
Distributor ID: Raspbian
Description:    Raspbian GNU/Linux 10 (buster)
Release:    10
Codename:   buster
- Kernel
- Model
Raspberry Pi 4 Model B Rev 1.1

Categories: Uncategorized

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