Installing QEMU is quite trivial, as we just saw. Let's have a look at what the QEMU metapackage installed on Ubuntu looks like:
root@kvm:~# dpkg --list | grep qemu ii ipxe-qemu 1.0.0+git-20150424.a25a16d-1ubuntu1 all PXE boot firmware - ROM images for qemu ii qemu 1:2.5+dfsg-5ubuntu10.8 amd64 fast processor emulator ii qemu-block-extra:amd64 1:2.5+dfsg-5ubuntu10.8 amd64 extra block backend modules for qemu-system and qemu-utils ii qemu-slof 20151103+dfsg-1ubuntu1 all Slimline Open Firmware -- QEMU PowerPC version ii qemu-system 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries ii qemu-system-arm 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries (arm) ii qemu-system-common 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries (common files) ii qemu-system-mips 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries (mips) ii qemu-system-misc 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries (miscelaneous) ii qemu-system-ppc 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries (ppc) ii qemu-system-sparc 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries (sparc) ii qemu-system-x86 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU full system emulation binaries (x86) ii qemu-user 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU user mode emulation binaries ii qemu-user-binfmt 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU user mode binfmt registration for qemu-user ii qemu-utils 1:2.5+dfsg-5ubuntu10.8 amd64 QEMU utilities root@kvm:~#
From the preceding output, we can see that there are few packages involved. If you are interested, you can read the individual description to get more familiar with what each package provides.
It's worth mentioning that all binaries provided from the earlier-mentioned packages start with the prefix QEMU. You can use tab completion to see the list of available executables: