This is not related to Grafana.
This is a problem that is related to dl.bintray.com - the place where openhab repository is located.
It is a known problem.
Somewhere in the forum a workaround is mentioned. In case I find it I will add it here.
EDIT:
The workaround that is mentioned in the other thread suggests to manually download the deb files using the wget command. You also could use a browser to do so. For this you would need to know where to download the files. Then you could manually install the files.
Would you like to continue to try that way ?
I also saw this several times but I never downloaded the files to the local filesystem to manually install the files. Instead I retried the installation a few days later. Might be that I had more luck…
The second command will print out the URLs of both packages ( openhab2 and openhab2-addons ).
The package management will take care about showing the URL/package that is related to your system architecture.
Indeed it should be two locations as openhab2 and openhab2-addons are two packages. Thus one location per package.
You may use wget, curl or a browser to download the files.
Then you can use
cd <into directory containing the two files>
sudo apt install ./<filenameOH>.deb ./<filenameOHaddons>.deb