On a CentOS server, when running
yum update
It failed with following error
acl-2.2.51-14.el7.x86_64 is a duplicate with acl-2.2.51-12.el7.x86_64 alt-libcurlssl-7.60.0-1.el7.x86_64 is a duplicate with alt-libcurlssl-7.54.0-8.el7.cloudlinux.x86_64 alt-php-config-1-29.1.el7.noarch is a duplicate with alt-php-config-1-27.el7.noarch alt-php44-4.4.9-88.el7.x86_64 is a duplicate with alt-php44-4.4.9-81.el7.x86_64 alt-php44-bcmath-4.4.9-88.el7.x86_64 is a duplicate with alt-php44-bcmath-4.4.9-81.el7.x86_64
https://gist.github.com/serverok/c0853120baff8848054cfb598e389c3a
This is because previous “yum update” failed for some reason after package install. So no cleanup was done.
To fix, you need to use package-cleanup command.
yum install yum-utils
To list all duplicate packages, run
package-cleanup --dupes
To remove all duplicate packages, run
package-cleanup --cleandupes
Now do a yum update
yum update
This will update your system and install any missing packages.
To verify if there any problem, run
package-cleanup --problems
If this does not fix, try yum fix duplicate package error
See yum