Getting error, upgrade from 2.8 to 2.8.1 Debian 10 Buster PREEMPT-RT ISO

I am using instruction to upgrade my linuxcnc from 2.8. to 2.8.1 and getting error when try to accessing key from command. It's the different error than dirmngr. So I stucked here.

This message is from keyserver. Not important. Try next steps

chris@cnc wrote:

This message is from keyserver. Not important. Try next steps

Got error in synaptic package manager

/*
W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Packages (non-free/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Packages (non-free/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Translations (non-free/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list:5
W: Target Sources (master-rtpreempt/source/Sources) is configured multiple times in /etc/apt/sources.list.d/linuxcnc.list:1 and /etc/apt/sources.list.d/linuxcnc.list:2

*/

Seems your sources.list is corrupt. I can't give you my example.
Try to fix it and add line:
deb buildbot.linuxcnc.org/ buster master-rtpreempt
If not possible show your file. Command:

cat /etc/apt/sources.list

Here buildbot.linuxcnc.org/ is also a solution for your keyserver message.

chris@cnc wrote:

Seems your sources.list is corrupt. I can't give you my example.
Try to fix it and add line:
deb buildbot.linuxcnc.org/ buster master-rtpreempt
If not possible show your file. Command:

cat /etc/apt/sources.list

Here buildbot.linuxcnc.org/ is also a solution for your keyserver message.

What to put exactly in synaptic package manager

URL?
Distribution?
Section(s):?

for both deb and deb-src?
It also has a drop down section to select between Binary (deb) and Source (deb-src), It should be left default?
I am using Debian 10 Buster PREEMPT-RT ISO

Hi
I am not an expert but I have had the same problem and there were several lines in the files.
I simply deleted the repeated lines.
I expect to help.
Bye

andypugh wrote:

I think that the problem is that you are trying to install from scratch on top of an existing installation.

All you really need to do is update LinuxCNC. And I am surprised that the OS isn't nagging you to do that.

That was my doing in wrong way.
I just used command line to update it. And it's done