TrueType fonts are not installing correctly in Linux Mint 20.1 MATE

I have successfully installed TrueType fonts umpteen times using ttf-mscorefonts-installer via the command line, or via Software Manager in Linux Mint.

I have tried both methods with Linux Mint 20.1 MATE and there is no sign of TT fonts like Arial, Times New Roman, Verdana etc. and yes, I did agree to the EULA.

Has anybody else experienced this?

Any suggestions?

This is the output from $ ls /usr/share/fonts/truetype:

Code:joebloggs@lenovo:~$ ls /usr/share/fonts/truetype
abyssinica Gargi lohit-malayalam padauk
dejavu Gubbi lohit-oriya pagul
droid kacst lohit-punjabi Sahadeva
fonts-beng-extra kacst-one lohit-tamil samyak
fonts-deva-extra lao lohit-tamil-classical samyak-fonts
fonts-gujr-extra liberation lohit-telugu Sarai
fonts-guru-extra liberation2 malayalam sinhala
fonts-kalapi lohit-assamese msttcorefonts tibetan-machine
fonts-orya-extra lohit-bengali Nakula tlwg
fonts-telu-extra lohit-devanagari Navilu ttf-khmeros-core
fonts-yrsa-rasa lohit-gujarati noto ubuntu
freefont lohit-kannada openoffice
joebloggs@lenovo:~$