How to Fix: Centos8 dnf update transaction check error

The error 'Transaction check error: file /usr/lib64/libgdbm_compat.so.4.0.0 from install of gdbm-libs-1:1.18-1.el8.x86_64 conflicts with file from package gdbm-1.10-8.el7.x86_64' occurs when you try to update or upgrade your CentOS 8 system using the 'dnf' package manager, especially after upgrading from CentOS 7. This error is caused by a conflict between two versions of the 'gdbm' library.

This issue can be frustrating because it prevents you from fully utilizing the features and updates available in your system. However, with the right steps, you can resolve this problem and continue using your system without any interruptions.

🔍 Why This Happens

• The primary reason for this error is the presence of conflicting files between different versions of the 'gdbm' library. This occurs when the package manager tries to install packages that have been previously installed, but with different versions. In this case, the 'gdbm-libs-1:1.18-1.el8.x86_64' package is trying to install a file (/usr/lib64/libgdbm_compat.so.4.0.0) that already exists in the system from the 'gdbm-1.10-8.el7.x86_64' package.
• Another possible reason for this error is related to the RPM database corruption, which can occur due to a variety of reasons such as incomplete or corrupted package installations, disk errors, or other issues with the RPMDB.

✅ Best Solutions to Fix It

💡 Conclusion

To fix the 'Transaction check error' on CentOS 8, you can try rebuilding the RPM database using the 'rpm --rebuilddb' command or use the '--best' and '--allowerasing' options when running 'dnf update'. If these steps do not resolve the issue, it may be necessary to investigate further into the cause of the problem and take additional corrective action.