This points to a filesystem problem, not to a bug in the shadow package. If your filesystem is intact, you should never get a "device or resource busy" error when unpacking a new package.
** Changed in: shadow (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to shadow in Ubuntu. https://bugs.launchpad.net/bugs/1516618 Title: package login 1:4.1.5.1-1.1ubuntu4 failed to install/upgrade: unable to install new version of `/bin/su': Device or resource busy Status in shadow package in Ubuntu: Invalid Bug description: Ubuntu 15.04 The error occurred when updating Ubuntu using "sudo aptget-update; sudo apt-get upgrade". The output from the command is attached as a text file. ProblemType: Package DistroRelease: Ubuntu 15.04 Package: login 1:4.1.5.1-1.1ubuntu4 ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10 Uname: Linux 3.13.0-40-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.7 Architecture: amd64 Date: Mon Nov 16 08:15:57 2015 DpkgTerminalLog: Preparing to unpack .../login_1%3a4.1.5.1-1.1ubuntu4.1_amd64.deb ... Unpacking login (1:4.1.5.1-1.1ubuntu4.1) over (1:4.1.5.1-1.1ubuntu4) ... dpkg: error processing archive /var/cache/apt/archives/login_1%3a4.1.5.1-1.1ubuntu4.1_amd64.deb (--unpack): unable to install new version of `/bin/su': Device or resource busy DuplicateSignature: package:login:1:4.1.5.1-1.1ubuntu4:unable to install new version of `/bin/su': Device or resource busy ErrorMessage: unable to install new version of `/bin/su': Device or resource busy InstallationDate: Installed on 2014-03-08 (617 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) RelatedPackageVersions: dpkg 1.17.25ubuntu1 apt 1.0.9.7ubuntu4.2 SourcePackage: shadow Title: package login 1:4.1.5.1-1.1ubuntu4 failed to install/upgrade: unable to install new version of `/bin/su': Device or resource busy UpgradeStatus: Upgraded to vivid on 2015-04-27 (202 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1516618/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp