nohup is not preventing jobs from receiving SIGHUP when the shell ends

[Paulo Marcel Coelho Aragão]

nohup seems to have stopped working, not sure since when. It's easy to reproduce:

1. Close your default browser
2. Run:

nohup sensible-browser &

3. Wait for the browser to open
4. Close the terminal emulator

The browser is terminated.

I have discovered that, instead of running nohup, the job has to be removed from the job table:

sensible-browser &
disown

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: coreutils 8.28-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Jul 19 10:21:56 2018
InstallationDate: Installed on 2018-04-28 (82 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: coreutils
UpgradeStatus: No upgrade log present (probably fresh install)