This has been fixed in initramfs-tools 0.125ubuntu1 in Ubuntu 16.10 yakkety. From debian/changelog:
- init: drop -b from hostname as it is not supported by busybox ** Changed in: initramfs-tools (Ubuntu) Status: Triaged => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu. https://bugs.launchpad.net/bugs/1545297 Title: hostname: invalid option -- '-b' displayed during boot Status in initramfs-tools package in Ubuntu: Fix Released Bug description: During boot, you can see for a short time "hostname: invalid option -- 'b'" and a line about busybox, and a few other lines. Checking /usr/share/initramfs-tools/init, which is copied into the initramfs during creation, indeed reveals a hostname call with "-b". Also, unpacking my current initramfs and calling bin/hostname, the following is displayed, which IIRC coincides very well with the message displayed during boot for a short time: $ bin/hostname -b bin/hostname: invalid option -- 'b' BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) multi-call binary. Usage: hostname [OPTIONS] [HOSTNAME | -F FILE] Get or set hostname or DNS domain name -s Short -i Addresses for the hostname -d DNS domain name -f Fully qualified domain name -F FILE Use FILE's content as hostname $ The initramfs should only use hostname options which busybox understands. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: initramfs-tools 0.120ubuntu6 ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1 Uname: Linux 4.2.0-27-generic x86_64 NonfreeKernelModules: zfs zunicode zcommon znvpair zavl nvidia ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 CurrentDesktop: XFCE Date: Sat Feb 13 16:43:48 2016 PackageArchitecture: all SourcePackage: initramfs-tools UpgradeStatus: Upgraded to wily on 2016-02-11 (1 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1545297/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp