Mathematica has received the signal: SIGSEGV and has exited
 

I Install Mathematica 4.0 on Ubuntu 10.04 and fedora 13. When i create new notebook file and save it, Mathematica front end automatically disappear. It shows message "Mathematica has received the signal: SIGSEGV and has exited" on terminal. But this not happing on older Linux version such as suse enterprise desktop 10. if i first create aaa.nb file using vi editor i can open it with Mathematica front end and save it. but cannot do "save as option" and also cannot open edit-> preferences menu.
What can be the problem...

SIGSEGV, or Segmentation Fault, occurs when a program tries to access a piece of memory that it didn't allocate (and could be in use by another running program).
It is strange that it occurs in such a basic operation as file save/save as.

Do you have similar problems in other software?
If so, there could be something wrong with accessing the disk (e.g. in the lower level routines rather than in Mathematica's code).

Are you sure Mathematica isn't performing some other calculations when the SIGSEGV occurs?

You mention the "front end" of Mathematica - is there a backend involved as well? Or did you simply mean the "window" or graphical interface?

There is no error in the lower level routines.
Mathematica isn't performing some other calculations when the SIGSEGV occurs.

"front end" of Mathematica mean the "window" or graphical interface. I can do calculation in this frontend. But when i am saving this using save/save as below error occures.

"Mathematica has received the signal: SIGSEGV and has exited.
If possible, please report this problem to support@wolfram.com
describing in in as much detail as possible what you were doing
when the problem occurred.

[1]+ Segmentation fault mathematica"

this is not happening when using gedit or Kile. But this version works well with older linux distribution like suse enterprise 10
Now i install mathematica version 4.0 on open suse 11.0 on a intel core 2 quad 2.66 computer.

But if i create a mathematica notebook file using gedit or vi and save using the same editor with file name myfirst.nb. if i open this file "mathematica aa.nb" in command line i can do all mathematical operation in the frontend(window) and save it. but can't do save as (error occurs).

if i open this file(myfirst.nb) using mathematica front editor when this error occurs..