If your Marketplace is stuck giving you a message "Another user or service is currently using the package manager" or if you have had no updates apart from clearsdn ones since February and you are using ClearOS7 then you may have locked yum processes. If you do a:
and see 3 processes they need to be killed. Either do a:
ps -aux | grep yum | grep -v grep
or reboot your system.
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