Existing lock /var/run/yum.pid: another copy is running as pid 19342.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory : 156 M RSS (1.4 GB VSZ)
    Started: Tue Oct 20 12:19:14 2020 - 06:54 ago
    State  : Sleeping, pid: 19342
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory : 156 M RSS (1.4 GB VSZ)
    Started: Tue Oct 20 12:19:14 2020 - 06:56 ago
    State  : Sleeping, pid: 19342

is..ok: rm -rf /var/run/yum.pid