Ubuntu MATE not booting on Pi 3+

[Knoms]

Hello there,

I'm new to this forum, so I hope I'm doing this right...

So I got a Raspberry Pi 3 Model B+ a few weeks ago and I have been using Raspbian as OS. However, I want to try Ubuntu MATE now because I think I might prefer it to Raspbian.
I tried to install MATE 16.04.2 for Raspberry Pi on my Micro SD card (16GB, Class 10, A1). I used Win32DiskImager on Windows 10 to flash the .img file onto my Micro SD card. When I tried to boot the Pi from this card, it stopped at the rainbow screen and showed the lightning bolt symbol. The red LED keeps flashing in a specific pattern.
I read some things online and as far as I've found out, the lightning symbol indicates the Pi not getting enough energy from the power supply. This doesn't make sense though, as I'm using the 5V 3.0A power supply that came with my Pi case, so it's made for the Pi. I also read that people use their Pi with much weaker power supplies and it works for them. Anyway, I tried to use a weaker power supply and it didn't work either. I also tried various different cables.
Raspbian boots up just fine, so the Pi hardware itself can't be the issue. My Micro SD card can't be the issue either, as I had Raspbian installed on it before and it worked fine. I also tried to install MATE on other cards, didn't work.

Does anyone know how to fix this? Thank you very much!

[mahjongg]

The official update for the 3B+ of ubuntu mate isn't out yet, there is a community written update floating about in this forum you could try.

the boot problem sticky has some 3B+ related info on the "blue under voltage icon", it just means "you are using incompatible software".

[Knoms]

The official update for the 3B+ of ubuntu mate isn't out yet, there is a community written update floating about in this forum you could try.

the boot problem sticky has some 3B+ related info on the "blue under voltage icon", it just means "you are using incompatible software".

Thanks for your answer! I wasn't aware of that, I thought it would work for all models, should have done some more research...
I'll try the community written update then, thank you very much!

[fruitoftheloom]

The official update for the 3B+ of ubuntu mate isn't out yet, there is a community written update floating about in this forum you could try.

the boot problem sticky has some 3B+ related info on the "blue under voltage icon", it just means "you are using incompatible software".

Thanks for your answer! I wasn't aware of that, I thought it would work for all models, should have done some more research...
I'll try the community written update then, thank you very much!

Search Forum for Ubuntu-Mate for 3B+ has been covered extensively in a recent post.

[nix77]

sorry that is off topic) fruitoftheloom how can I get in touch with you? I have a question on raspberry pi and 5.1 usb audio card. Help or assist advice or council please.