I',m having a trouble at running Einstein@home at ubuntu.

Dirk, could you report back here and tell us if installing ia32-libs solves your problem, please? And is the sudo apt-get install ia32-libs command the correct command? The reason I ask is because I want to document the fix in the wiki. I think Kathryn probably gave you the correct command but I would like someone to verify it. I run just Fedora, no Ubuntu here, so I can't verify it myself.

Also, if you are in doubt about whether any binary is 32 bit or 64 bit, run the file command on it. For example, in my /home/dagorath/BOINC/projects/einstein.phys.uwm.edu directory, there are 3 binaries (executables) from Einstein plus several other data files, compressed files, etc. If I open a terminal and change directory to /home/dagorath/BOINC/projects/einstein.phys.uwm.edu and do "file *", that runs the file command on each of the files. This is the output:

earth_05_09:                                   ASCII text
einstein_S5R4_6.02_graphics_i686-pc-linux-gnu: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.0.30, not stripped
einstein_S5R4_6.02_i686-pc-linux-gnu:          ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, for GNU/Linux 2.0.30, not stripped
einstein_S5R4_6.02_i686-pc-linux-gnu_0:        ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.0.30, not stripped
einstein_S5R4_6.02_i686-pc-linux-gnu_1:        ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.0.30, not stripped
einstein_S5R4_6.02_i686-pc-linux-gnu_2:        ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.0.30, not stripped
h1_0894.85_S5R4:                               data
h1_0894.85_S5R4__860_S5R4a_1_0:                Zip archive data, at least v2.0 to extract
h1_0894.90_S5R4:                               data
h1_0894.95_S5R4:                               data
h1_0895.00_S5R4:                               data
h1_0895.05_S5R4:                               data
h1_0895.10_S5R4:                               data
h1_0895.15_S5R4:                               data
h1_0895.20_S5R4:                               data
l1_0894.85_S5R4:                               data
l1_0894.90_S5R4:                               data
l1_0894.95_S5R4:                               data
l1_0895.00_S5R4:                               data
l1_0895.05_S5R4:                               data
l1_0895.10_S5R4:                               data
l1_0895.15_S5R4:                               data
l1_0895.20_S5R4:                               data
skygrid_0900Hz_S5R4.dat:                       Zip archive data, at least v2.0 to extract
sun_05_09:                                     ASCII text

You can also run the file commmand on individual files by typing the filename instead of the *.