Comment 2 for bug 1684233

Hello, your logs indicate some problems. It sure looks like your /usr/sbin/adduser and /usr/sbin/addgroup programs have been modified and that appears to be preventing other programs from running correctly. Repairing this may be difficult depending upon when those programs were corrupted and what might have tried to use them in the meantime.

Perhaps this is accidental and perhaps this is malicious. (If malicious it's very sloppy.)

If you think this is accidental try:
sudo apt-get install --reinstall adduser

The logs:

adduser 3.113+nmu3ubuntu4 [modified: usr/sbin/adduser]

Setting up ntp (1:4.2.8p4+dfsg-3ubuntu5.4) ...
Installing new version of config file /etc/dhcp/dhclient-exit-hooks.d/ntp ...
/usr/sbin/addgroup: 32: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 33: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 34: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 35: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 38: /usr/sbin/addgroup: my: not found
/usr/sbin/addgroup: 43: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 44: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 45: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 46: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 47: /usr/sbin/addgroup: use: not found
/usr/sbin/addgroup: 52: /usr/sbin/addgroup: BEGIN: not found
/usr/sbin/addgroup: 53: local: not in a function
dpkg: error processing package ntp (--configure):
 subprocess installed post-installation script returned error exit status 2

Thanks