Make display go to sleep, add hdmi_blanking=1 into /boot/config.txt
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It works, even when using a HDMI2DVI adapter.
Putting the parameter “hdmi_blanking=1” in the “/boot/config.txt” file allows me do disable all screen saver functions in the UbuntuMATE OS, and thus reducing processing power 
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I’ve downloaded from a couple of different mirrors that you have listed and the output from md5sum for the downloaded file does not match the hash which you’ve posted (059d74d51d0f36fd30b504907f646e6d). I am seeing 61287c1881b166c05b89a8cdc39e12b5 as the hash. I also tried the hash on the .img file instead of the .xz file, and that doesn’t match either. Was a newer version uploaded and the value not updated on the web page for the project? File is: ubuntu-mate-15.10.1-desktop-armhf-raspberry-pi-2.img.xz
As long as you download it from the official UbuntuMATE for Raspberry Pi 2 download page, you ought to be fine.
Just downloaded the image again via its torrent file 2 days ago, flashed it to my microSD card, and could run the UbuntuMATE installer on my RPi 2 device without any problems.
whenever I try to install, the resoloution is all off for my monitor, making it frustratingley unusable.
please help!
Take a look at /boot/config.txt there are options in there for setting the resolution of the monitor.
Now it just boots into emergency mode, after I reinstalled the image. Will someone pease help?
I noticed one of the changes of the new version of Mate 15.10 is a slightly updated kernel, as the changelog states:
Updated to Linux 4.1.15 (previous one was 4.1.13)
But I also noticed that the repositores have a version 4.2.0 of the kernel for the Raspberry Pi. This one is probably coming from Ubuntu (the company) as I can see kernels for the Nexus 5 as well for example.
Has anyone tried upgrading the Ubuntu Mate kernel to the 4.2.0 version in the repositories? If yes, did it work? I am curious if anyone has tried that. I may try it myself too once I get an additional MicroSD card.
Geoff
Checking the official RPi-Firmware repository today, it is still bumped up to version 4.1.16 for the RPi devices. Guess, it will take a short while though to release 4.2
This said, you can always use the command “sudo rpi-update” to update to the latest official RPI kernel release.
Nice job, better for our middle school than Raspbian Jessie. Two main issues for your next release: please make the date / time update automatic, we could n´t even get into Wikipedia due to the wrong system date.
Second is get Raspberry hardware acceleration inside Firefox and VLC some how. The speed of omxplayer is good but the interface is too different; Epiphany on Raspbian was up to speed but again the different interface (bookmarks etc.).
On time synchronisation, because the Pi doesn’t have a battery, the system time is lost when the Pi is powered off. When you turn the Pi back on, it takes a while for the ntp daemon to synchronise the time. If you install ntpdate, the time is synchronised as soon as the network interface comes up. To install ntpdate from a terminal, run apt-get install ntpdate
I read recently that ntpdate has been deprecated, which means it will stop being maintained at some point.
From UbuntuMATE 15.10 onwards, time synchronisation with Internet sources can be handled with “systemd”.
Have a look in my post about “UbuntuMATE 15.10 reset RTC chip date & time during bootup”, on the second described approach that also works without an RTC chip using only the “timesyncd” daemon and operates only when network connectivity is available, thus removing the complexity of NTP 
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Hello and thank you for creating a fantastic OS for the Raspberry Pi.
I have it running on a raspberry Pi 2 with the official 7" touchscreen. Ubuntu MATE works much better than the Raspbian install that i have been using and the interface just seems more responsive.
I have an issue with the accessibility ‘simulate right-click’ that is normally available in Ubuntu. I have seen lots of screenshots of the ‘second tab’ in the mouse config, but in MATE, it is just not there.
The assistive technologies are there, but i do not see anything to turn on the ‘simulate right click, by holding down left click’ which should be an option. Any help with finding the right-click, using a left long-click, would be super!
as an additional thing, some of the config screens are too big for the resolution of 800 x 480, but i have got around that by using a bluetooth keyboard and using left-alt and left-mouse click to drag the top of the config screens off the top of the desktop, enabling me to see the bottom of the window. A touchscreen option would be great for that but it is early days yet. 
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Are there any plans for a 64 bit build to support the Raspberry Pi 3?
See here about a 64-bit build:
I get scrambled audio from Pandora and YouTube with this, but raspbian works fine. It doesn’t matter if I am using analog, USB audio, or HDMI.
This is what I am dealing with: https://vimeo.com/159695009
Can’t boot. Had no problems creating the boot disk, in fact I did it both ways: command line and GDisk. Boot starts right of with a kernel panic - not syncing, then about another dozen lines of errors and ends with: random: nonblocking pool is initialized.
If you need me to post a picture just let me know.
Any help would be appreciated! Thanks.
Just tried 16.04 on my new Pi 3 and found that it lacks integrated RDP or VNC and doesn’t support SSH via PuTTY for the headless startup I require.