ubuntu14.04 (64-bit) run 32-bit program

ubuntu14.04 out for a while, today's whim of the 12.04 version to upgrade to the 14.04 version, after the tragedy of the upgrade, 32-bit program can not run up. All kinds of Baidu Google, find the most is

Sudo-i
cd/etc/apt/sources.list.d
echo "debhttp://archive.ubuntu.com/ubuntu/raring main restricted universe Multiverse ">ia32-libs-raring.list
apt-get update
apt-get installia32-libs
RM ia32-libs-raring.list
apt-get Update
exit

But I was prompted when I performed the update.

w:failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring-security/universe/source/Sources 404 Not  Found [ IP:91.189.88.153 80]

Raring is the 13.04 version code, now not maintained, so replace the 12.04 code, the steps are as follows

Sudo-i
cd/etc/apt/sources.list.d
echo "debhttp://archive.ubuntu.com/ubuntu/precise main restricted Universe Multiverse ">ia32-libs-raring.list
apt-get update
apt-get installia32-libs
RM Ia32-libs-raring.list
apt-get Update
exit

After the above operation, everything is done, and finally can run normally.