apt-get install firefox
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libav-tools libavdevice53 libavfilter3 libdc1394-22 m4 procmail rtmpdump
  sendmail-base sendmail-cf sensible-mda
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  libdbusmenu-gtk4 xul-ext-ubufox
Suggested packages:
  ttf-lyx
The following NEW packages will be installed:
  firefox libdbusmenu-gtk4 xul-ext-ubufox
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 42.2 MB of archives.
After this operation, 97.9 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libdbusmenu-gtk4 i386 12.10.3+14.04.20140612-0ubuntu1 [25.9 kB]
Get:2 http://archive.ubuntu.com/ubuntu/ trusty-updates/main firefox i386 42.0+build2-0ubuntu0.14.04.1 [42.1 MB]
Get:3 http://archive.ubuntu.com/ubuntu/ trusty-updates/main xul-ext-ubufox all 3.2-0ubuntu0.14.04.1 [35.0 kB]
Fetched 42.2 MB in 3s (12.4 MB/s)
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)