MattyAB@Horcrux:/mnt/d/Documents/bitcoin/depends$ sudo apt-get install g++-mingw-w64-x86-64 mingw-w64-x86-64-dev
[sudo] password for MattyAB:
Reading package lists... Done
Building dependency tree
Reading state information... Done
g++-mingw-w64-x86-64 is already the newest version (5.3.1-8ubuntu3+17).
mingw-w64-x86-64-dev is already the newest version (4.0.4-2).
0 to upgrade, 0 to newly install, 0 to remove and 101 not to upgrade.

MattyAB@Horcrux:/mnt/d/Documents/bitcoin/depends$ sudo apt-get install build-essential libtool autotools-dev automake pkg-config bsdmainutils curl
[sudo] password for MattyAB:
Reading package lists... Done
Building dependency tree
Reading state information... Done
automake is already the newest version (1:1.15-4ubuntu1).
autotools-dev is already the newest version (20150820.1).
bsdmainutils is already the newest version (9.0.6ubuntu3).
build-essential is already the newest version (12.1ubuntu2).
libtool is already the newest version (2.4.6-0.1).
pkg-config is already the newest version (0.29.1-0ubuntu1).
curl is already the newest version (7.47.0-1ubuntu2.2).
0 to upgrade, 0 to newly install, 0 to remove and 101 not to upgrade.