hi i accidentally removed apt package itself. now how do i get it back i tried with dpkg -i apt_0.6.25_i386.deb but i get error like Authenticating apt_0.6.25_i386.deb ... debsig: Origin Signature check failed. This deb might not be signed. dpkg: error processing apt_0.6.25_i386.deb (--install): Verification on package apt_0.6.25_i386.deb failed! Errors were encountered while processing: apt_0.6.25_i386.deb