ureadahead, set by ubuntu-standard, is not needed with systemd

[dino99]

Description:

- ubuntu vivid has set systemd as default and upstart the alternative choice
- systemd comes with its own readahead implementation
- ubuntu-standard install ureadahead (depends on)

Now ubuntu-standard needs to deal with the two choices:
- need to install ureadahead if upstart is used
- if systemd is used, then ureadahead should be ignored

The always ureadahead installation push lot of unexpected flood into journalctl
https://bugs.launchpad.net/ubuntu/+source/ureadahead/+bug/1429098 (comments #17 +)

*********************************************************
Possible solution:
- adding ureadahead as a dependency of upstart-sysv
- removing ureadahead as a dependency of ubuntu-standard
*********************************************************

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-minimal 1.334
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1
Architecture: i386
CurrentDesktop: GNOME
Date: Mon Apr 20 17:31:07 2015
JournalErrors: Error: command ['journalctl', '-b', '--priority', 'warning'] failed with exit code 1: No journal files were found.
SourcePackage: ubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)

[dino99 (9d9)]

Feedback:

that ureadahead flood in journalctl on Wily is not seen with the latest kernel 4.1.0.3.3 (wily-proposed), as it was seen previously.

[dino99 (9d9)]

Please ignore the comment #4 above: on the next boot due to some crashes (upstart, xorg, gnome-shell) the ureadahead comments are again flooding journalctl

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[dino99 (9d9)]

ubuntu-standard still 'recommends' ureadahead in yakkety.

[Bryan Quigley (bryanquigley)]

This is longer true with 217 and higher, as systemd implementation has been removed.
        * systemd's readahead implementation has been removed. In many
          circumstances it didn't give expected benefits even for
          rotational disk drives and was becoming less relevant in the
          age of SSDs. As none of the developers has been using
          rotating media anymore, and nobody stepped up to actively
          maintain this component of systemd it has now been removed.

Closing this bug.