I am trying to follow the instructions for installing these kernels, but there is clearly something wrong. Firstly the installs all fail with the following known bug: bcmwl-kernel-source 6.30.223.248+bdcom-0ubuntu1: bcmwl kernel module failed to build [error: macro "alloc_netdev" requires 4 arguments, but only 3 given] Edit Ubuntu “bcmwl” package Bugs Bug #1358966 This is obviously a simple error which could be fixed in a minute. I suspect it is the failed installation that causes the resulting system boot kernel panic because of a missing init. Secondly when I issue the specified command in the web page to remove the 3.18 headers and kernel the following happens: sudo apt-get remove linux-headers-3.18* linux-image-3.18* Reading package lists... Building dependency tree... Reading state information... Package 'linux-headers-3.16.0-23' is not installed, so not removed Package 'linux-headers-3.16.0-23-generic' is not installed, so not removed Package 'linux-headers-3.16.0-23-lowlatency' is not installed, so not removed Package 'linux-image-3.16.0-23-generic' is not installed, so not removed Package 'linux-image-3.16.0-23-lowlatency' is not installed, so not removed Package 'linux-headers-3.16.0-24' is not installed, so not removed Package 'linux-headers-3.16.0-24-generic' is not installed, so not removed Package 'linux-headers-3.16.0-24-lowlatency' is not installed, so not removed Package 'linux-headers-3.16.0-25-lowlatency' is not installed, so not removed Package 'linux-image-3.16.0-24-generic' is not installed, so not removed Package 'linux-image-3.16.0-24-lowlatency' is not installed, so not removed Package 'linux-image-3.16.0-25-lowlatency' is not installed, so not removed The following package was automatically installed and is no longer required: thermald Use 'apt-get autoremove' to remove it. The following packages will be REMOVED: linux-generic linux-headers-3.16.0-25 linux-headers-3.16.0-25-generic linux-headers-3.18.0-031800rc5 linux-headers-3.18.0-031800rc6 linux-headers-3.18.0-031800rc6-generic:i386 linux-headers-generic linux-image-3.16.0-25-generic linux-image-extra-3.16.0-25-generic linux-image-generic 0 upgraded, 0 newly installed, 10 to remove and 0 not upgraded. After this operation, 425 MB disk space will be freed. Do you want to continue? [Y/n] (Reading database ... 215753 files and directories currently installed.) Removing linux-generic (3.16.0.25.26) ... Removing linux-headers-generic (3.16.0.25.26) ... Removing linux-headers-3.16.0-25-generic (3.16.0-25.33) ... Removing linux-headers-3.16.0-25 (3.16.0-25.33) ... Removing linux-headers-3.18.0-031800rc5 (3.18.0-031800rc5.201411162035) ... Removing linux-headers-3.18.0-031800rc6-generic (3.18.0-031800rc6.201411231935) ... Removing linux-headers-3.18.0-031800rc6 (3.18.0-031800rc6.201411231935) ... Removing linux-image-generic (3.16.0.25.26) ... Removing linux-image-extra-3.16.0-25-generic (3.16.0-25.33) ... run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic run-parts: executing /etc/kernel/postinst.d/dkms 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic update-initramfs: Generating /boot/initrd.img-3.16.0-25-generic run-parts: executing /etc/kernel/postinst.d/pm-utils 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic run-parts: executing /etc/kernel/postinst.d/update-notifier 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic Generating grub configuration file ... Found linux image: /boot/vmlinuz-3.18.0-031800rc6-generic Found initrd image: /boot/initrd.img-3.18.0-031800rc6-generic Found linux image: /boot/vmlinuz-3.16.0-25-generic Found initrd image: /boot/initrd.img-3.16.0-25-generic Found memtest86+ image: /boot/memtest86+.elf Found memtest86+ image: /boot/memtest86+.bin Found Windows 7 (loader) on /dev/sda2 Found Windows 7 (loader) on /dev/sda3 Found Ubuntu 14.10 (14.10) on /dev/sda6 done Removing linux-image-3.16.0-25-generic (3.16.0-25.33) ... WARN: Proceeding with removing running kernel image. Examining /etc/kernel/prerm.d. run-parts: executing /etc/kernel/prerm.d/dkms 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic dkms: removing: bcmwl 6.30.223.248+bdcom (3.16.0-25-generic) (x86_64) -------- Uninstall Beginning -------- Module: bcmwl Version: 6.30.223.248+bdcom Kernel: 3.16.0-25-generic (x86_64) ------------------------------------- Status: Before uninstall, this module version was ACTIVE on this kernel. wl.ko: - Uninstallation - Deleting from: /lib/modules/3.16.0-25-generic/updates/dkms/ - Original module - No original module was found for this module on this kernel. - Use the dkms install command to reinstall any previous module version. depmod.... DKMS: uninstall completed. ------------------------------ Deleting module version: 6.30.223.248+bdcom completely from the DKMS tree. ------------------------------ Done. Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic update-initramfs: Deleting /boot/initrd.img-3.16.0-25-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.16.0-25-generic /boot/vmlinuz-3.16.0-25-generic Generating grub configuration file ... Found linux image: /boot/vmlinuz-3.18.0-031800rc6-generic Found initrd image: /boot/initrd.img-3.18.0-031800rc6-generic Found memtest86+ image: /boot/memtest86+.elf Found memtest86+ image: /boot/memtest86+.bin Found Windows 7 (loader) on /dev/sda2 Found Windows 7 (loader) on /dev/sda3 Found Ubuntu 14.10 (14.10) on /dev/sda6 done The link /vmlinuz.old is a damaged link Removing symbolic link vmlinuz.old you may need to re-run your boot loader[grub] The link /initrd.img.old is a damaged link Removing symbolic link initrd.img.old you may need to re-run your boot loader[grub] In other words the command removed every kernel EXCEPT the broken 3.18 kernel! So the partition I am using to test 3.18 is now unbootable. I have had to reinstall Ubuntu 14.10 from the DVD. Please fix the installation of 3.18 and get back to me. I will not try anything more until I get a clean installation.