Next to the Raspberry Pi Remote Access recomendations, and in the case you want to access UbuntuMATE’s desktop environment with a VNC client, follow the additional steps:
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On the shell prompt, type: sudo apt-get install tightvncserver
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With you favorite text editor,create a text file “/etc/lightdm/lightdm.conf” with the following contents:
[VNCServer]
enabled=true
port=5900
width=1360
height=768
depth=16
The value of width and height describes the window resolution when connecting with a VNC client. Other width x height working resolutions are possible with: 800x600, 1024x768, 1152x854, 1280x768, 1280x800, 1280x960, 1280x1024, 1400x1050, 1440x900, 1600x1200, 1680x1050, 1792x1344, 1856x1392, 1920x1200, 1920x1220, 2560x1600.
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On the shell prompt, type: sudo /etc/init.d/lightdm restart
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Then use your favourite VNC client, and type as target host i.e. “mypi.local” without precising any port number
Hope this helps 