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I'm trying to install OL 8.3 using the x86_64-boot-uek.iso but I'm always getting "Error setting up base repository" even though my network connection is fine.
Any ideas how to proceed?
I agree. I've submitted an internal enhancement request to configure default repos using https://yum.oracle.com for our UEK-based boot ISOs, but until then, you will need to configure the following three repos to successfully install using the UEK Boot ISO:
Installation source: https://yum.oracle.com/repo/OracleLinux/OL8/baseos/latest/x86_64
If you configure btrfs as the file system for / or /boot then enabling the ol8_UEKR6 repo is critical otherwise the system will not boot after install, as the RHCK does not not support btrfs.
I ran into the same thing and per some notes in the official installation documentation (https://docs.oracle.com/en/operating-systems/oracle-linux/8/install/F13930.pdf), I change the http:// to https:// and added "yum.oracle.com/repo/OracleLinux/OL8/baseos/latest/x86_64" as the repository URL and it worked for me. Why they didn't set a sensible default like this makes no sense to me, but this should solve it for you. Enjoy!