Script started on Mon 18 Sep 2017 16:06:54 BST
tj@hephaestion:~/Hacking/libunwind8$ apt-get --download-only install libunwind8:i386
[sudo] password for tj:
Reading package lists... Done
Building dependency tree...
Reading state information... Done
The following packages will be upgraded:
  libunwind8:i386
1 to upgrade, 0 to newly install, 0 to remove and 1 not to upgrade.
Need to get 0 B/46.4 kB of archives.
After this operation, 1,024 B disk space will be freed.
Download complete and in download only mode

tj@hephaestion:~/Hacking/libunwind8$ dpkg-deb --raw-extract /var/cache/apt/archives/libunwind8_1.1-4.1_i386.deb .

tj@hephaestion:~/Hacking/libunwind8$ sed -i 's/^\(Package: libunwind8\)$/\1\nMulti-Arch: same/' DEBIAN/control

tj@hephaestion:~/Hacking/libunwind8$ dpkg-deb --build . ../
dpkg-deb: building package 'libunwind8' in '..//libunwind8_1.1-4.1_i386.deb'.
tj@hephaestion:~/Hacking/libunwind8$ ls ../
libunwind8_1.1-4.1_i386.deb

tj@hephaestion:~/Hacking/libunwind8$ sudo dpkg -i libunwind8_1.1-4.1_i386.deb 
(Reading database ... 
dpkg: warning: files list file for package 'libunwind8:amd64' missing; assuming package has no files currently installe
dpkg: warning: files list file for package 'libunwind8:i386' missing; assuming package has no files currently installed
Reading database ... 482568 files and directories currently installed.
Preparing to unpack ../libunwind8_1.1-4.1_i386.deb ...
Unpacking libunwind8:i386 (1.1-4.1) over (1.1-4.1) ...
Setting up libunwind8:i386 (1.1-4.1) ...
Processing triggers for libc-bin (2.23-0ubuntu9) ...
tj@hephaestion:~/Hacking/libunwind8$ exit
exit

Script done on Mon 18 Sep 2017 16:10:00 BST