I can not run updates without an error either via plesk panel or on command line, the following error ocurs:
ERROR: Failed to run the Yum utility. The Yum utility failed to install the required packages. Attention! Your software might be inoperable. Please, contact product technical support.
/var/log/plesk/install/autoinstaller3.log you can find these errors:
Warning: RPMDB altered outside of yum. Exception: Scriptlet or other non-fatal errors occurred during transaction. YumDownloadError: [u'Errors were encountered while downloading packages. failure: [Errno 256] No more mirrors to try.']
Yum cache failed to fetch the required repositories.
yum cache by following below steps:
# rm -rf /var/lib/rpm/__db.*
# rpm --rebuilddb
# yum clean all
# yum makecache
Start update again.