ubuntu minimal build fail due to missing

[Chao Guo]

Get:55 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main initramfs-tools-bin amd64 0.103ubuntu4.7 [9026 B]
Get:56 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main cpio amd64 2.11+dfsg-1ubuntu1.2 [73.8 kB]
Get:57 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main plymouth amd64 0.8.8-0ubuntu17.1 [98.6 kB]
Get:58 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main libpng12-0 amd64 1.2.50-1ubuntu2.14.04.2 [118 kB]
Get:59 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main libplymouth2 amd64 0.8.8-0ubuntu17.1 [76.8 kB]
Get:60 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main libpam-runtime all 1.1.8-1ubuntu2.2 [37.8 kB]
Get:61 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main multiarch-support amd64 2.19-0ubuntu6.13 [4488 B]
Get:62 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main locales all 2.13+git20120306-12.1 [2695 kB]
Get:63 http://cn.archive.ubuntu.com/ubuntu/ trusty-updates/main makedev all 2.3.1-93ubuntu2~ubuntu14.04.1 [24.5 kB]
Fetched 22.7 MB in 18s (1202 kB/s)
debconf: delaying package configuration, since apt-utils is not installed
E: Can not write log (Is /dev/pts mounted?) - openpty (2: No such file or directory)
dpkg: warning: 'sh' not found in PATH or not executable
dpkg: warning: 'rm' not found in PATH or not executable
dpkg: warning: 'tar' not found in PATH or not executable
dpkg: error: 3 expected programs not found in PATH or not executable
Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin
E: Sub-process /usr/bin/dpkg returned an error code (2)
2017-08-08 10:48:36.062 INFO diskimage_builder.block_device.blockdevice [-] State already cleaned - no way to do anything here
Unmount /tmp/dib_build.EJqXNSbV/mnt/var/cache/apt/archives

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/491653