This is probably due to missing free space on your partition:
Selecting previously deselected package python-pexpect.
Unpacking python-pexpect (from .../python-pexpect_2.1-1_all.deb) ...
dpkg: error processing /var/cache/apt/archives/python-pexpect_2.1-1_all.deb (--unpack):
failed in buffer_write(fd) (10, ret=-1): backend dpkg-deb during `./usr/share/doc/python-pexpect/copyright': No space left on device
dpkg-deb: failed to create directory: No space left on device
This is probably due to missing free space on your partition: pexpect_ 2.1-1_all. deb) ... apt/archives/ python- pexpect_ 2.1-1_all. deb (--unpack): share/doc/ python- pexpect/ copyright' : No space left on device
Selecting previously deselected package python-pexpect.
Unpacking python-pexpect (from .../python-
dpkg: error processing /var/cache/
failed in buffer_write(fd) (10, ret=-1): backend dpkg-deb during `./usr/
dpkg-deb: failed to create directory: No space left on device