** Description changed:

- 
  Test:
  sudo flock /var/lib/dpkg/lock -c \
  'echo 1; apt-get -o Debug::NoLocking=true check; echo 2; apt-get check'
  
  Expected behavior:
  apt-get fails in stage 2.
  
  
- Workaround (needs moreutils package)
+ Workaround (needs moreutils package, which is not installed by default):
  
  sudo lckdo /var/lib/dpkg/lock /bin/sh -c \
  'echo 1; apt-get -o Debug::NoLocking=true check; echo 2; apt-get check'
  
  
  Similarly, flock does not recognize lock set by e.g. apt-get.
+ 
+ man lckdo:
+ "Now that util-linux contains a similar command named flock, lckdo is 
deprecated, and will be removed from some  future version of moreutils."
+ 
+ So developer can not rely on lckdo.
+ 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: util-linux 2.20.1-5.1ubuntu20.9
  ProcVersionSignature: Ubuntu 4.4.0-96.119~14.04.1-generic 4.4.83
  Uname: Linux 4.4.0-96-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.25
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Sep 30 16:30:50 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-21 (1105 days ago)
  InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.1)
  SourcePackage: util-linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.cron.weekly.fstrim: 2014-09-21T13:07:51.420447

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https://bugs.launchpad.net/bugs/1720541

Title:
  flock does not lock dpkg lock file properly

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