Ubuntu dropping i386 support

Starting with the upcoming 'Eoan Ermine' (a.k.a. 19.10) release, the Ubuntu
distribution will
not support 32-bit x86 systems. 'The Ubuntu engineering team has
reviewed the facts before us and concluded that we should not continue to
carry i386 forward as an architecture. Consequently, i386 will not be
included as an architecture for the 19.10 release, and we will shortly
begin the process of disabling it for the eoan series across Ubuntu
infrastructure.'