More and more organisations prevent (and disable) usb and sd ports on 
notebooks. So booting tails with usb is no option.
Would this be good practice to use tails by booting the iso (on the 
internal disk) with grub to ram. When tails is running, the present 
harddisks are not mounted.
so, Download official tails iso from the tails website, gpg verify the 
iso and after this booting the iso with grub.
for example with(warning, not working):
wget 
https://mirror.alpix.eu/tails/tails/stable/tails-amd64-3.16/tails-amd64-3.16.iso
wget 
https://tails.boum.org/torrents/files/tails-amd64-3.16.img.sig
wget 
https://tails.boum.org/tails-signing.key
gpg --import tails-signing.key
TZ=UTC gpg --no-options --keyid-format long --verify 
/iso/tails-amd64-3.16.img.sig /iso/tails-amd64-3.16.iso
if [ $? -eq 0 ]
then
     yad  --width=220  --title "**Iso verified**" --text "Iso is 
verified"  --button="OK"
else
     yad  --width=220  --title "**Iso not verified**" --text "Iso is not 
verified"  --button="OK"
fi