[Qa-jenkins-scm] Build failed in Jenkins: d-i_schroot-sid-upgrade #702

[jenkins at jenkins.debian.net]

https://jenkins.debian.net/job/d-i_schroot-sid-upgrade/702/------------------------------------------
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/hudson1309942487598872260.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 2017-01-19-0225.55.pdiff [13.8 kB]
Get:5 http://ftp.de.debian.org/debian sid/main Sources 2017-01-19-0826.59.pdiff [6021 B]
Get:6 http://ftp.de.debian.org/debian sid/main Sources 2017-01-19-1426.40.pdiff [24.0 kB]
Get:7 http://ftp.de.debian.org/debian sid/main Sources 2017-01-19-2027.26.pdiff [15.3 kB]
Get:8 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-19-0225.55.pdiff [23.5 kB]
Get:7 http://ftp.de.debian.org/debian sid/main Sources 2017-01-19-2027.26.pdiff [15.3 kB]
Get:9 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-19-0826.59.pdiff [24.9 kB]
Get:10 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-19-1426.40.pdiff [18.1 kB]
Get:11 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-19-2027.26.pdiff [41.2 kB]
Get:11 http://ftp.de.debian.org/debian sid/main amd64 Packages 2017-01-19-2027.26.pdiff [41.2 kB]
Fetched 450 kB in 17s (25.9 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