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Can't install Melodic on Ubuntu 18.04 [..] I have x32 version of ubuntu [..] Is this a problem?

Yes, that's the cause of the error you mention.

There are no x86 (32 bit) packages of ROS Melodic on Ubuntu Bionic (ie: 18.04).

As you already found, there are only amd64 (64 bit) packages available.

You'd have to install an amd64 version of Bionic to be able to install Melodic using apt.

Can't install Melodic on Ubuntu 18.04 [..] I have x32 version of ubuntu [..] Is this a problem?

Yes, that's the cause of the error you mention.

There are no x86 (32 bit) packages of ROS Melodic on Ubuntu Bionic (ie: 18.04).

See also REP 3: Target Platforms: Architectures.

As you already found, there are only amd64 (64 bit) packages available.

You'd have to install an amd64 version of Bionic to be able to install Melodic using apt.