Based on the errors above, apt cannot access the ubuntu package repository servers. Check your network configuration and proxy.
Sorry, but I'm not that stupid to not have a connection. When you check the links above, does they exists or not?
They do not exist. If you do "apt-cache show pulseaudio:i386" what does it say for Filename? Does "apt-get pulseaudio:i386" work, or does it fail in the same way?
Filename: pool/main/p/pulseaudio/pulseaudio_1.1-0ubuntu15_i386.deb
parallels@parallels-Parallels-Virtual-Platform:~$ apt-get download pulseaudio:i386
Err Downloading pulseaudio 1:1.1-0ubuntu15.1
404 Not Found [IP: 91.189.91.15 80]
if you sudo apt-get update, does your issue resolve itself?
Thank you John, after update the Steam installer works.
Nothing extracted yet.
The installer stops with message:
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/n/nspr/libnspr4_4.8.9-1ubuntu2.3_i386.deb 404 Not Found [IP: 91.189.91.15 80]
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/n/nss/libnss3_3.13.1.with.ckbi.1.88-1ubuntu6.1_i386.deb 404 Not Found [IP: 91.189.92.200 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/p/pulseaudio/libpulse0_1.1-0ubuntu15.1_i386.deb 404 Not Found [IP: 91.189.91.15 80]