Thanks for the kind help. It appears that if I add the following option, --noscripts , when running rpm, then the problem went away. However, I don't know how to work this option into yum. Specifically, I am having problem updating/installing firefox. The error message I received is: error: %post(firefox-1.0.4-1.4.1.centos4.i386) scriptlet failed, exit status 255 I am dumping the entire output as follows: [pwzhangz@localhost dl]$ sudo yum install firefox Setting up Install Process Setting up Repos kbs-CentOS-Extras 100% |=========================| 951 B 00:00 kbs-CentOS-Misc 100% |=========================| 951 B 00:00 update 100% |=========================| 951 B 00:00 base 100% |=========================| 1.1 kB 00:00 addons 100% |=========================| 951 B 00:00 extras 100% |=========================| 1.1 kB 00:00 Reading repository metadata in from local files kbs-CentOS: ################################################## 1002/1002 kbs-CentOS: ################################################## 60/60 update : ################################################## 142/142 base : ################################################## 1404/1404 addons : ################################################## 2/2 extras : ################################################## 30/30 Resolving Dependencies --> Populating transaction set with selected packages. Please wait. ---> Package firefox.i386 0:1.0.4-1.4.1.centos4 set to be updated --> Running transaction check Dependencies Resolved Transaction Listing: Install: firefox.i386 0:1.0.4-1.4.1.centos4 - update Total download size: 16 M Is this ok [y/N]: y Downloading Packages: Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Installing: firefox 100 % done 1/1 error: %post(firefox-1.0.4-1.4.1.centos4.i386) scriptlet failed, exit status 255 Installed: firefox.i386 0:1.0.4-1.4.1.centos4 Complete! (Thereafter, I was not able to start firefox.) Thanks for the help again, this forum is unbelievable. > - specifically, search here: > http://groups-beta.google.com/group/linux.redhat.rpm > > Zoran