[SOLVED] Installation openhab2: HTTP Error 404, Problem acceessing/start/index

Hello guys,
I have installed to my RPi 3 (Raspian Distribution, September 2019, Release date: 2019-09-26, Kernel version: 4.19 openhab2 with this instructions.
After the installation I would like to start openhab for the first time with this instructions.
On the Chromium browser I get the error: “HTTP ERROR 404. Problem accessing/start/index. Reason: Not Found”.
I don’t know where is the error…
Can someone help me?
Thanks in advance!

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You installed openhab2-addons package, correct?
This is a known issue. If your system will have Internet access to download needed addons you do not need that package. In this case, the easiest solution is to uninstall BOTH openhab2 and the addons Then just install openhab2.

If you will need both packages, there is a more involved workaround. This issue will be fixed in 2.5.1, hopefully this month.

@Bruce_Osborne:
Thanks for your quick and detailed answer!
My step for the installation:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install screen mc vim git htop
wget -qO - ‘https://bintray.com/user/downloadSubjectPublicKey?username=openhab’ | sudo apt-key add -
sudo apt-get install apt-transport-https
echo ‘deb https://dl.bintray.com/openhab/apt-repo2 stable main’ | sudo tee /etc/apt/sources.list.d/openhab2.list
sudo apt-get update
sudo apt-get install openhab2
sudo apt-get install openhab2-addons
sudo systemctl start openhab2.service
sudo systemctl status openhab2.service
sudo systemctl daemon-reload
sudo systemctl enable openhab2.service

I would like to work with openhab and trying to implement some smart home ideas.
It is better to wait for the new version of openhab?
Thanks for our help!

OK do this

sudo systemctl stop openhab2.service
sudo apt-get remove openhab2-addons
sudo apt-get remove openhab2
sudo apt-get install openhab2
sudo systemctl start openhab2.service
sudo systemctl status openhab2.service
sudo systemctl daemon-reload
sudo systemctl enable openhab2.service

Believe it or not, the workaround is a little more complex.

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Thank you so much for your quick answer.
Wow, now it works!!!
Now I’m a openhab user, too.
By

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Welcome to the community.