Warning message from needrestart on apt package installation

[Petter Adsen]

Whenever I install/update packages with apt, I get warning messages from needrestart. This did not happen <16.04. 'sudo apt install i3blocks' gives:

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  i3blocks
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 26.7 kB of archives.
After this operation, 117 kB of additional disk space will be used.
Get:1 http://no.archive.ubuntu.com/ubuntu xenial/universe amd64 i3blocks amd64 1.4-1 [26.7 kB]
Fetched 26.7 kB in 18s (1,473 B/s)
Selecting previously unselected package i3blocks.
(Reading database ... 193073 files and directories currently installed.)
Preparing to unpack .../i3blocks_1.4-1_amd64.deb ...
Unpacking i3blocks (1.4-1) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up i3blocks (1.4-1) ...
Use of uninitialized value in chdir at /usr/share/perl5/NeedRestart/Interp/Python.pm line 123.============================================ ]
Use of chdir('') or chdir(undef) as chdir() is deprecated at /usr/share/perl5/NeedRestart/Interp/Python.pm line 123.
Scanning processes...
Scanning candidates...
Scanning linux images...
No containers need to be restarted.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: needrestart 2.6-1
ProcVersionSignature: Ubuntu 4.4.0-30.49-generic 4.4.13
Uname: Linux 4.4.0-30-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: i3
Date: Fri Jul 15 12:24:56 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-06-22 (22 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
PackageArchitecture: all
SourcePackage: needrestart
UpgradeStatus: No upgrade log present (probably fresh install)