If you'd like to download the latest ifupdown2 on your ubuntu box you can use this .deb:
$ wget http://ftp.us.debian.org/debian/pool/main/i/ifupdown2/ifupdown2_1.0~git20170314-1_all.deb
If you'd like to download the latest ifupdown2 on your ubuntu box you can use this .deb:
$ wget http:// ftp.us. debian. org/debian/ pool/main/ i/ifupdown2/ ifupdown2_ 1.0~git20170314 -1_all. deb