Without network it is not possible to update to the fixed version, anyway it is possible to downgrade to the previous version: cd /var/cache/apt debpkg -i ./isc-dhcp-client_4.1.1-P1-15ubuntu3*deb ./isc-dhcp-common_4.1.1-P1-15ubuntu3*deb
then reboot.
Without network it is not possible to update to the fixed version, anyway it is possible to downgrade to the previous version: client_ 4.1.1-P1- 15ubuntu3* deb ./isc-dhcp- common_ 4.1.1-P1- 15ubuntu3* deb
cd /var/cache/apt
debpkg -i ./isc-dhcp-
then reboot.