Package: gdb Version: 7.12-3 Since version 7.12-2, gdb is marked as "Multi-Arch: same" which is not correct. Because /usr/bin/gdb (among other files) is different across architectures, multiple versions of gdb are not actually coinstallable.
-- System Information: Debian Release: stretch/sid APT prefers unstable APT policy: (500, 'unstable'), (101, 'experimental') Architecture: i386 (x86_64) Kernel: Linux 4.9.0-nouveau (SMP w/2 CPU cores) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages gdb depends on: ii libbabeltrace-ctf1 1.5.0-1 ii libbabeltrace1 1.5.0-1 ii libc6 2.24-8 ii libexpat1 2.2.0-1 ii liblzma5 5.2.2-1.2 ii libncurses5 6.0+20161126-1 ii libpython3.5 3.5.2-9 ii libreadline7 7.0-1 ii libtinfo5 6.0+20161126-1 ii zlib1g 1:1.2.8.dfsg-4 Versions of packages gdb recommends: ii libc6-dbg [libc-dbg] 2.24-8 Versions of packages gdb suggests: ii gdb-doc 7.11.1-1 ii gdbserver 7.12-3 -- no debconf information