There is an official package in Ubuntu software repository that you can just install by typing on the terminal:
sudo apt install ttf-mscorefonts-installer
Sudo gives you “admin” privilege;
apt install asks the system to perform the install command to be run using apt software;
ttf-mscorefonts-installer is the “package” with the installer.
These fonts do not include Calibri used in office, or the new segoeUI that is used in Windows…
For those, just copy and paste them from a windows installation.