Installation troubleshooting v15
Difficulty displaying Java-based applications
If you encounter difficulty displaying Java-based server features (controls or text not being displayed correctly, or blank windows), upgrading to the latest libxcb-xlib libraries should correct the problem on most distributions. See the Java bug database for other possible workarounds.
The installation fails to complete eue to existing data directory contents
If an installation fails to complete due to an existing content in the data directory, the server writes an error message to the server logs:
A data directory is neither empty, or a recognisable data directory.
If you encounter a similar message, you should confirm that the data directory is empty; the presence of files (including the system-generated lost+found folder) prevents the installation from completing. Either remove the files from the data directory, or specify a different location for the data directory before re-invoking the installer to complete the installation.
Difficulty installing the EPEL release package
If you encounter difficulty when installing the EPEL release package, you can use the following command to install the epel-release package on RHEL/CentOS 7.x and RHEL/Rocky Linux/AlmaLinux 8.x:
yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm dnf -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
You might need to enable the [extras] repository definition in the CentOS-Base.repo file (located in /etc/yum.repos.d). If yum cannot access a repository that contains epel-release, an error message appears:
No package epel available. Error: Nothing to do
If you receive this error, you can download the EPEL rpm package, and install it manually. To manually install EPEL, download the rpm package, assume superuser privileges, navigate into the directory that contains the package, and install EPEL with the command:
yum -y install epel-release dnf -y install epel-release