Please help with error message

[Rodolfo Medina <rodolfo.medina@gmail.com>]

Some little problems after `full-upgrade' to Sid: no sound...  Besides, when
trying to install new packages, the following message appears:

# aptitude install alsaplayer-alsa pulseaudio 
pulseaudio is already installed at the requested version (12.0-1)
pulseaudio is already installed at the requested version (12.0-1)
The following NEW packages will be installed:
  alsaplayer-alsa alsaplayer-common{a} alsaplayer-gtk{a} libmikmod3{a} 
0 packages upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/505 kB of archives. After unpacking 1,410 kB will be used.
Do you want to continue? [Y/n/?] y
dpkg: warning: 'ldconfig' not found in PATH or not executable
dpkg: warning: 'start-stop-daemon' not found in PATH or not executable
dpkg: error: 2 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)
dpkg: warning: 'ldconfig' not found in PATH or not executable
dpkg: warning: 'start-stop-daemon' not found in PATH or not executable
dpkg: error: 2 expected programs not found in PATH or not executable
Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin

Please help...  I'm not expert.

Thanks in advance,

Rodolfo