r95@7emptest:~/NROT/sobfu$ sudo apt install libeigen3-dev
[sudo] password for r95:
Reading package lists... Done
Building dependency tree
Reading state information... Done
libeigen3-dev is already the newest version (3.3.4-4).
libeigen3-dev set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.