[Bug 1868042] [NEW] root filesystem is not mounted readonly as advertised

[native-api]

Public bug reported:

Subj. Reproduction steps:

- (Install Bionic from http://releases.ubuntu.com/18.04/ubuntu-18.04.4
-desktop-amd64.iso into Virtualbox Windows x64 6.0.10 r132072.
Recommended requirements for VM hardware, Minimal installation, default
parameters elsewhere)

- Enter recovery mode
=> The menu says: "filesystem state: read-only"
- Enter root shell
=> # mount
<...>
/dev/sda1 on / type ext4 (rw,relatime,errors=remount-ro)
<...>
- Ctrl-D
=> The menu still says: "filesystem state: read-only"

As a result, I cannot do anything that requires a readonly mount (in my
case, needed `zerofree` to shrink the virtual disk file).

A workaround is "echo u >/proc/sysrq-trigger" or Alt-SysRq-U.

** Affects: friendly-recovery (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1868042

Title:
  root filesystem is not mounted readonly as advertised

Status in friendly-recovery package in Ubuntu:
  New

Bug description:
  Subj. Reproduction steps:

  - (Install Bionic from http://releases.ubuntu.com/18.04/ubuntu-18.04.4
  -desktop-amd64.iso into Virtualbox Windows x64 6.0.10 r132072.
  Recommended requirements for VM hardware, Minimal installation,
  default parameters elsewhere)

  - Enter recovery mode
  => The menu says: "filesystem state: read-only"
  - Enter root shell
  => # mount
  <...>
  /dev/sda1 on / type ext4 (rw,relatime,errors=remount-ro)
  <...>
  - Ctrl-D
  => The menu still says: "filesystem state: read-only"

  As a result, I cannot do anything that requires a readonly mount (in
  my case, needed `zerofree` to shrink the virtual disk file).

  A workaround is "echo u >/proc/sysrq-trigger" or Alt-SysRq-U.

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