I failed to remote connect to Raspberry Pi 3 from Ubuntu

Question

I just bought raspberry pi 3 with Rapbian Jessi with Pixel and I have a Lenovo laptop with Ubuntu 14.04 64 bit on it.

I want to remote connect to it from my laptop. I enabled the VNC server on Raspberry Pi and I tried to connect to it from either Remmina 0.9.99.1, Remote Desktop Viewer, or even Gtk VNC Viewer. In Remmina it gives me the following error:

Unknown authentication scheme from VNC server: 13, 5, 6, 130, 192

I failed to make this work, although I can connect smoothly using SSH. Any ideas how can I make it work as it looks it should be a straight forward thing.

More details regarding this issue-solution on this post: https://raspberrypi.stackexchange.com/questions/68046/black-screen-using-vnc-with-raspbian-lite — ATSiem, Sep 04 '17 at 05:11
Instruction how to change vncserver configuration to support clients other than RealVNC Viewer: https://www.raspberrypi.org/documentation/remote-access/vnc/ -> Authenticating to VNC Server *Contains information how to set it by config file (without GUI access, required in this answer: https://raspberrypi.stackexchange.com/a/68842/110722). — morfis, Oct 31 '19 at 00:52

score 19 · Answer 1 · edited Jun 16 '20 at 10:47

19

later I found out another solution to make it work for Remmina 0.9.99.1. You can change the security authentication for the VNC server to be VNC Password instead of Unix password and create an admin user credentials so you can use it in the remote connection as the following:

On VNC Server side on Raspberry Pi 3

Go to the options on the VNC Server on Raspberry Pi 3 and you should have the sudo credentials when you started VNC server

Change the security authentication to VNC Password as shown below

Finally you need to add a user to use it to connect. In my case I created an administrator user (default username was admin)

On Remmina side on Ubnutu

You will create a new connection with the given IP address of the Raspberry Pi on your local network (you should be able to know it using ifconfig) and using the admin user credentials created on VNC server as the following:

Please note that It worked with me while encryption was off, as it made some problems mentioned in other posts. I will try to see if it will work with encrypted on or no.

edited Jun 16 '20 at 10:47

Community

1

answered Jun 22 '17 at 13:35

aibrahim

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Given that this requires turning off encryption I would consider this a non-starter from a security perspective. – Steve Robillard Jun 22 '17 at 13:59
1

non-starter unless you are using an ssh (encrypted) tunnel and restrict vnc either with a firewall or a network mask of allowed addresses (or both) – Scott Wood Oct 26 '17 at 15:40
I always use SSH tunnel and using -localhost (for tightvncserver) and ip mask for realvnc-vnc-server, so no one except me from tunnel can enter. Plus a little 8 lenght password, of course. Same for vps than for rpi. Security is a must, always. – m3nda Mar 30 '18 at 19:20
How do you do this from the terminal? (through SSH tunnel) – Elie G. Dec 19 '19 at 01:36
Doesn't seem to work. Newly installed Pi 2 Raspbian. – NoBugs Mar 07 '20 at 04:28
Please accept your own answer with a click on the tick on its left side. Only this will finish the question and it will not pop up again year for year. – Ingo Apr 03 '20 at 19:48
The proposed solution is still valid, but I additionally had to run sudo raspi-config and set resolution to 1280 x 720 (or 1920 x 1080) to overcome "Cannot currently show the desktop" after successful connection. Also, the newer Remmina didn't ask for the user name, only for password. Though, the default username was pi. Didn't find an option to disable encryption. – Roman Riabenko Feb 13 '22 at 15:03

score 12 · Answer 2 · edited Jan 11 '21 at 06:05

12

I've just encountered the issue too.

As an alternative to aibrahim's method if you are doing it remotely via ssh, here's my steps to VNC to display :0.

Setup password using sudo vncpasswd -service
Add the following lines to /root/.vnc/config.d/vncserver-x11 as described in RealVNC: Support legacy viewers
```
SecurityTypes=VncAuth
UserPasswdVerifier=VncAuth
```
Start vncserver using command sudo vncserver-x11-serviced

This method allows me to login using Ubuntu's Remmina VNC client.

edited Jan 11 '21 at 06:05

sebix

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answered May 30 '20 at 02:37

sonofusion82

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This worked perfectly in 2020 on a Pi 4 with latest rapsberry pi os – user230910 Aug 08 '20 at 00:53
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The service can be restarted with sudo systemctl restart vncserver-x11-serviced.service – Antonios Hadjigeorgalis Dec 13 '20 at 22:39
Worked perfectly on pi 3b / raspbian. – Yuri Feldman Mar 03 '21 at 12:37
Worked perfectly for me: Ubuntu 20.04 -> Raspberry Pi 4 Model B Rev 1.2 (Raspbian GNU/Linux 10 (buster)) – Glushiator Nov 04 '21 at 19:09
UPDATE: 2023-04-02 Ubuntu 22.04 LTS
RealVNC server on the RPi now has a checkbox to allow "legacy" logins. When this is checked, then Remmina may log in. This checkbox is found when setting the VNC Password for login of the "Standard user"
– guitarpicva Apr 02 '23 at 20:51

score 6 · Answer 3 · answered Jun 22 '17 at 13:11

6

The simplest solution is to install RealVNC Viewer. You can download it from here, and it is available for Linux, MacOS and Windows. The issue is with the encryption schemes used by different VNC servers.

answered Jun 22 '17 at 13:11

Steve Robillard

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Or better still use use a non-proprietrary VNC server such as tightvncserver – Milliways Jun 23 '17 at 00:43
fine only if you don't need an ssh tunnel – Scott Wood Oct 26 '17 at 15:40

score 4 · Answer 4 · answered Sep 08 '19 at 10:51

The main problem is that the Raspberri Pi runs RealVnc as server. Lots of answers suggest to connect using RealVncViewer. But RealVnc is not really free, it has a free version, and uses special encryption schemes. Probably good ones, but this makes it harder to use other VNC clients.

Steps to find out about this:

aptitude search vnc
look for installed packages with i in the first column
on my PI it showed realvnc

The obvious solution, and I tried this with success, is to remove the RealVNC server from the Pi, and to switch to a 'regular' VNC server like x11vnc. Steps:

Go to Preferences, Pi Configuration, Interfaces, and disable VNC
In a terminal: sudo aptitude remove realvnc-vnc-server
sudo aptitude install x11vnc # or another vnc server
start the VNC server with: x11vnc -display :0 (see also man x11vnc)

On your ubuntu pc, you may now connect to the PI with e.g. Remmina

Todo: start the VNC server on the PI in the background

@Ben The real un*x guru of course uses apt because (s)he knows all command line options by heart. But for the rest of us, aptitude is just a little easier to use. You will have to install it with something like apt-get install aptitude. It is available on Ubuntu, Raspbian, etc. — Roland, Jan 13 '21 at 10:04

score 3 · Answer 5 · answered Jun 22 '17 at 13:11

I found out that with the current authentication on VNC using linux authentication, the only way to make it work is to use the RealVNC viewer

all what you need is to download the binary file (or GZ file and un-compress it and then make the file executable and so you can run it.

score 2 · Answer 6 · edited Jan 01 '21 at 04:39

I had the same exact problem, after searching through I found that problem was related to authentication and following line helped me to resolve the issue. I forgot which Stack Exchange I found the answer from.

Here are the steps that I took:

Connect to your Raspberry Pi through ssh command.
```
ssh pi@your raspberry ip
```
Then enter your password to your Raspberry Pi.
Start your vncserver on your Raspberry Pi with the following command
```
vncserver -Authentication VncAuth :1
```
Go to your Remmina:
1. Set your protocol to VNC
2. Enter the IP address from your raspberry pi new desktop this should be in the last line after entering the code in step 2
Put your username and password for Raspberry Pi
If you set up different password for your VNC server you need to add to the prompt.

After this I was able to remote log-in to my Raspberry Pi.

I found bits and pieces of the info on different exchange and had to put it together.

score 0 · Answer 7 · answered Apr 02 '20 at 10:59

I had a similar problem when trying to connect to Raspbian Buster and the instructions at the link below solved my problem without having to install a new VNC server.

https://gitlab.com/Remmina/Remmina/-/wikis/Problems-and-tweaks/Remmina-VNC-to-Raspbian-Stretch

score 0 · Answer 8 · answered Sep 04 '17 at 05:02

I read tons of posts about this issue... and they all resulted in connection from my Mac via Remoter to a black screen on the Raspberry Pi.

DISPMANX was the ulimate solution to VNC into the Raspberry Pi running Raspbian Lite.

Here is the summary:

BASIC SETUP - RESULTS IN BLACK SCREEN FOR VNC

SSH Enabled via Raspi-Config on Raspberry Pi Remoter for Mac (VNC + SSH/Terminal Access) SETUP: https://computers.tutsplus.com/tutorials/take-control-of-your-raspberry-pi-using-your-mac-pc-ipad-or-phone--mac-54603

FINAL SETUP - TO ELIMINATE BLACK SCREEN FOR VNC

Desktop GUI for Raspbian Lite needs Additional Setup i.e. DISPMANX SETUP: http://raspmer.blogspot.ca/2015/07/vnc-server-for-raspberry-pi-with.html

START VNC VIA GUI - NOT REMOTE SSH sudo dispmanx_vncserver

CONNECT VIA REMOTER TO IP

More details regarding this issue-solution on this post: https://raspberrypi.stackexchange.com/questions/68046/black-screen-using-vnc-with-raspbian-lite — ATSiem, Sep 04 '17 at 05:11

I failed to remote connect to Raspberry Pi 3 from Ubuntu

8 Answers8

On VNC Server side on Raspberry Pi 3

On Remmina side on Ubnutu