[Qa-jenkins-scm] Build failed in Jenkins: d-i_schroot-sid-upgrade #704

[jenkins at jenkins.debian.net]

https://jenkins.debian.net/job/d-i_schroot-sid-upgrade/704/------------------------------------------
Started by user Holger Levsen
[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/hudson7445347583853368398.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 [226 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 2017-01-21-0226.38.pdiff [12.0 kB]
Get:5 http://ftp.de.debian.org/debian sid/main Sources 2017-01-21-0823.27.pdiff [3140 B]
Get:6 http://ftp.de.debian.org/debian sid/main Sources 2017-01-21-1422.59.pdiff [9617 B]
Get:7 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-21-0226.38.pdiff [15.0 kB]
Get:6 http://ftp.de.debian.org/debian sid/main Sources 2017-01-21-1422.59.pdiff [9617 B]
Get:8 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-21-0823.27.pdiff [3082 B]
Get:9 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-21-1422.59.pdiff [18.0 kB]
Get:9 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-21-1422.59.pdiff [18.0 kB]
Fetched 343 kB in 11s (31.0 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