~# dpkg -i graylog-4.3-repository_latest.deb
(Reading database ... 89684 files and directories currently installed.)
Preparing to unpack graylog-4.3-repository_latest.deb ...
Unpacking graylog-4.3-repository (1-6) over (1-6) ...
**Setting up graylog-4.3-repository (1-6)** ...
~# apt install graylog-server -y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
**graylog-server is already the newest version (4.2.13-1).**
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Please use his litte icon to make your code readable:
It is above the textfield.
If you have two files there, one with 4.2 and one with 4.3, clean that up to only one with 4.3