[Qa-jenkins-scm] Build failed in Jenkins: d-i_schroot-sid-upgrade #703

[jenkins at jenkins.debian.net]

https://jenkins.debian.net/job/d-i_schroot-sid-upgrade/703/------------------------------------------
Started by timer
[EnvInject] - Loading node environment variables.
Building on master in workspace <https://jenkins.debian.net/job/d-i_schroot-sid-upgrade/ws/>
[workspace] $ /bin/sh -xe /tmp/hudson8954684115190534288.sh
+ schroot --directory /root -u root -c source:jenkins-d-i-sid -- apt-get update
Get:1 http://ftp.de.debian.org/debian sid InRelease [228 kB]
Get:2 http://ftp.de.debian.org/debian sid/main Sources.diff/Index [27.9 kB]
Get:3 http://ftp.de.debian.org/debian sid/main amd64 Packages.diff/Index [27.9 kB]
Get:4 http://ftp.de.debian.org/debian sid/main Sources 2017-01-20-0226.56.pdiff [13.2 kB]
Get:5 http://ftp.de.debian.org/debian sid/main Sources 2017-01-20-0825.23.pdiff [6817 B]
Get:6 http://ftp.de.debian.org/debian sid/main Sources 2017-01-20-1426.29.pdiff [20.6 kB]
Get:7 http://ftp.de.debian.org/debian sid/main Sources 2017-01-20-2031.15.pdiff [17.4 kB]
Get:7 http://ftp.de.debian.org/debian sid/main Sources 2017-01-20-2031.15.pdiff [17.4 kB]
Get:8 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-20-0226.56.pdiff [8455 B]
Get:9 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-20-0825.23.pdiff [50.2 kB]
Get:10 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-20-1426.29.pdiff [21.6 kB]
Get:11 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-20-2031.15.pdiff [15.8 kB]
Get:11 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-20-2031.15.pdiff [15.8 kB]
Fetched 437 kB in 8s (51.8 kB/s)
W: No sandbox user '_apt' on the system, can not drop privileges
E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem. 
Build step 'Execute shell' marked build as failure