Selecting previously unselected package binutils:i386.
dpkg: error processing /var/cache/apt/archives/binutils_2.22-6ubuntu1_i386.deb (--unpack):
binutils:i386 2.22-6ubuntu1 (Multi-Arch: no) is not co-installable with binutils:amd64 2.22-6ubuntu1 (Multi-Arch: no) which is currently installed
Selecting previously unselected package cpp-4.6:i386.
dpkg: error processing /var/cache/apt/archives/cpp-4.6_4.6.3-1ubuntu5_i386.deb (--unpack):
cpp-4.6:i386 4.6.3-1ubuntu5 (Multi-Arch: no) is not co-installable with cpp-4.6:amd64 4.6.3-1ubuntu5 (Multi-Arch: no) which is currently installed
Selecting previously unselected package cpp:i386.
dpkg: error processing /var/cache/apt/archives/cpp_4%3a4.6.3-1ubuntu5_i386.deb (--unpack):
cpp:i386 4:4.6.3-1ubuntu5 (Multi-Arch: allowed) is not co-installable with cpp:amd64 4:4.6.3-1ubuntu5 (Multi-Arch: allowed) which is currently installed
Selecting previously unselected package binutils:i386. apt/archives/ binutils_ 2.22-6ubuntu1_ i386.deb (--unpack): apt/archives/ cpp-4.6_ 4.6.3-1ubuntu5_ i386.deb (--unpack): apt/archives/ cpp_4%3a4. 6.3-1ubuntu5_ i386.deb (--unpack):
dpkg: error processing /var/cache/
binutils:i386 2.22-6ubuntu1 (Multi-Arch: no) is not co-installable with binutils:amd64 2.22-6ubuntu1 (Multi-Arch: no) which is currently installed
Selecting previously unselected package cpp-4.6:i386.
dpkg: error processing /var/cache/
cpp-4.6:i386 4.6.3-1ubuntu5 (Multi-Arch: no) is not co-installable with cpp-4.6:amd64 4.6.3-1ubuntu5 (Multi-Arch: no) which is currently installed
Selecting previously unselected package cpp:i386.
dpkg: error processing /var/cache/
cpp:i386 4:4.6.3-1ubuntu5 (Multi-Arch: allowed) is not co-installable with cpp:amd64 4:4.6.3-1ubuntu5 (Multi-Arch: allowed) which is currently installed
so what do you not understand?