Having trouble executing bin files under 64-bit ubuntu systems? I sure had when trying to install CS:Source server.

root@Nyx:/srcds_1# chmox +x hlds
root@Nyx:/srcds_1# ./hlds
-bash: ./hlds: No such file or directory
The following command will solve everything as ubuntu seem to miss some libraries (and the error is so describing..)

sudo apt-get install ia32-libs