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Miscellaneous notes from converting Ubuntu 16.04 from NetworkManager/resolveconf to systemd-{networkd,resolved}.

In 14.04, system had the following /etc/network/interfaces:

auto br0
iface br0 inet dhcp
bridge_ports be0

and the following /etc/udev/rules/70-net-persistent.rules:

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="XX: ( Read more... )

Use case: Somewhere across the Internet is a git repo that we want to cache locally. We should be able to clone this cache-repo to do our development work, but the bare repo should only ever pull from its upstream. The flow looks like this: upstream repo <-- bare cache repo <-- work repo.

First, set up the bare repo:
$ git clone --bare git://git ( Read more... )

Silly recipe for creating a SSD cache with LVM without wasting space on the SSD device:

# pvcreate /dev/slowdisk ( Read more... )

Here's how to remap globally keyboard keys with udev's hwdb database, since I couldn't find a single document that documents all the steps correctly (for Ubuntu 14.04).
( Read More )

Hi all,

Here's how you install Ubuntu 14 with a LUKS-encrypted / and /boot partition when using Apple's "quirky and fun" EFI:

1. Insert a USB stick, and boot the installer into "Try Ubuntu" mode (you need to be able to start an xterm before rebooting).
2. Install Ubuntu. On the hard disk, you'll want to create a 64M empty partition, a 256M /boot ( ( Read more... )

Hi all,

Here's how you install Ubuntu 14 with a LUKS-encrypted / and /boot partition when using regular UEFI (i.e. not Apple's insane firmware):

1. Install Ubuntu. You'll want to create a 256M /boot (unencrypted), a LUKS container with LVM for /.
2. Disable SecureBoot. Hopefully I will figure out how to fix this later.
3. Boot the system to prove that it ( Read more... )

Hi all,

Here's how you install Ubuntu 14 with a LUKS-encrypted / and /boot partition when using legacy BIOS:

1. Install Ubuntu. You'll want to create a 256M /boot (unencrypted), a LUKS container with LVM for /.
2. Boot the system to prove that it boots correctly.
3. Copy the contents of /boot somewhere, and note the device (say /dev/sda1 for this example).
4. ( Read more... )

Same instructions as http://djwong.livejournal.com/66501.html, but with a few notes ( Read more... )

Let's face it folks, Apple's firmware isn't EFI1 and it isn't UEFI2 either. It's a weird "hybrid", i.e. mess. I posted quite some time ago about how to make AAPLEFI find grub2-efi, but it's slow because the firmware scans all boot devices looking for bootx64.efi files, and it's not easily recoverable if your machine forgets one of the pieces it ( Read more... )