Public bug reported:

On boot root does not get remounted rewriteable and leads to system
freezing.

Symptoms:
- Regular boot stops after unpacking initramfs


Steps to reprocude (on my system):
1. Boot into recovery, which still works
2. Select "repair dpkg", then select remount root writeable
Systemd now says it remounted root writeable, a green "[OK]"
Followed complains of dpkg  beacause root's not writeable
3. select "root shell" in the recovery menu
4. there proof that / not mountable with "touch /tmp/x"
5. execute fsck and see, everythings ok
6. execute "mount -o remount,rw /"
7. see that root is now writeable with "touch /tmp/x"
8. close root shell and choose to continue boot in recovery menu
9. system is starting now without any problems

Two things go wrong here:
A) root isn't remounted writeable but there's no reason to refuse 
B) systemd says OK, but didn't do it job


Various Information about installed Ubuntu:
$ uname -a
Linux Z30 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux
$ cat /etc/issue
Ubuntu 16.04.1 LTS \n \l

$ dpkg -S /lib/systemd/systemd-remount-fs
systemd: /lib/systemd/systemd-remount-fs
$ dpkg -l systemd | grep ^ii
ii  systemd        229-4ubuntu13 amd64        system and service manager

I tried this with various kernels without any difference in behaviour
(4.4.0-21, 4.4.0-31, 4.4.0-53, 4.4.0-47).

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1652761

Title:
  [16.04 LTS] systemd systemd-remount-fs does NOT remount root writeable
  but says it did

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