While installing arm-elf-toolchain I was receiving this error message:
Unpacking u-boot-modified (from .../u-boot-modified_1.2.0-0bsprak4~natty_i386.deb) ... dpkg: error processing /var/cache/apt/archives/u-boot-modified_1.2.0-0bsprak4~natty_i386.deb (--unpack): trying to overwrite '/usr/bin/mkimage', which is also in package u-boot-tools 2010.12-2 Errors were encountered while processing: /var/cache/apt/archives/u-boot-modified_1.2.0-0bsprak4~natty_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1)
I solved this issue just executing:
$ sudo dpkg -i --force-overwrite /var/cache/apt/archives/u-boot-modified_1.2.0-0bsprak4~natty_i386.deb