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tmp]$ sudo yum --enablerepo=epll install firefox-compat
Loaded plugins: priorities, update-motd, upgrade-helper
Could not retrieve mirrorlist http://repo.lambda-linux.io/2018.03/epll/x86_64/os/mirror.list error was
14: HTTP Error 403 - Forbidden

One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

 1. Contact the upstream for the repository and get them to fix the problem.

 2. Reconfigure the baseurl/etc. for the repository, to point to a working
 upstream. This is most often useful if you are using a newer
 distribution release than is supported by the repository (and the
 packages for the previous distribution release still work).

 3. Disable the repository, so yum won't use it by default. Yum will then
 just ignore the repository until you permanently enable it again or use
 --enablerepo for temporary usage:

 yum-config-manager --disable <repoid>

 4. Configure the failing repository to be skipped, if it is unavailable.
 Note that yum will try to contact the repo. when it runs most commands,
 so will have to try and fail each time (and thus. yum will be be much
 slower). If it is a very temporary problem though, this is often a nice
 compromise:

 yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: epll/2018.03/x86_64

Appreciate any assistance.