Strange issue: sudo: effective uid is not 0, is sudo installed setuid root?

[mk01]

edit /boot/cmdline.txt and add "init=/bin/bash" at the end of line
reboot
xbian will boot directly into command prompt with root privileges
run commands:

Code:

for f in bin etc lib media mnt opt root sbin usr var xbmc-backup; do chown -R root $f; done
chown root:root /home
chown syslog /var/log/*
chown -R man /var/cache/man
chown -R xbian:xbian /usr/local/share/xbmc/addons/plugin.xbianconfig
chmod 4755 /usr/bin/sudo

then update cmdline.txt again - just revert to previous content (remove init=/bin/bash)
after restart

Code:

sudo dpkg-reconfigure -a