Hello everyone, I installed ISPConfig 3 with CentOS 5.4, and I had the problem of conflicts of liblzo.so.1 packages in an attempt to solve, now SMTP-Server is offline. Searching the forums I saw that you have not found a solution, because if I understand there is an issue of priority of update RPM packages, I would switch to use another distribution. What do you recommend to travel with the maximum compatibility with ISPConfig 3 Debian or Ubuntu? Or maybe you advise me to go with CentOS, and find the solution to your knowledge exist? On servers I have always worked with CentOS and ISPConfig 2 We carry the last error that with yum update Thank you in advance for all your comments. Code: --> Running transaction check --> Processing Dependency: liblzo.so.1()(64bit) for package: lzop ---> Package lzo.x86_64 0:2.02-3.el5.kb set to be updated --> Finished Dependency Resolution lzop-1.01-2.el5.rf.x86_64 from installed has depsolving problems --> Missing Dependency: liblzo.so.1()(64bit) is needed by package lzop-1.01-2.el5.rf.x86_64 (installed) Error: Missing Dependency: liblzo.so.1()(64bit) is needed by package lzop-1.01-2.el5.rf.x86_64 (installed) You could try using --skip-broken to work around the problem You could try running: package-cleanup --problems package-cleanup --dupes rpm -Va --nofiles --nodigest The program package-cleanup is found in the yum-utils package.