If you're getting SEGVs from 'ldd', you've got way more problems than inability to setup ArcSDE.
I can't really help you stabilize your OS, but you're going to need that before you're likely to make
progress on the ArcSDE install.
- V
A segmentation fault (often shortened to segfault), bus error or access violation is generally an attempt to access memory that the CPU cannot physically address.