to maintain Windows installed:
1. disable BitLocker (Impostazioni->Aggiornamenti Sicurezza->Crittografia->Disabilità) 2. disable Secure Boot (from BIOS) 3. re-order the booting devices (from BIOS) 3. use a USB to boot the ubuntu 21.04
Backlight / nomodeset
In case you are using a laptop with intel i7 gen. 11th and iRIS XE graphics you should use kernel 5.11.0-16-generic A possible solution is to add the following lines in /etc/default/grub:
GRUB_DEFAULT=saved GRUB_SAVEDEFAULT=true
Then reboot the system, select Opzioni avanzate per Ubuntu and Ubuntu, con Linux 5.11.0-16-generic. You must do that only once to save your preferences.
Wi-fi
To install the correct drive you should follow these command (and might read the discussion at this [link](https://forum.ubuntu-it.org/viewtopic.php?t=637471)):
1. Make sure you have a proper build environment and dkms installed. 2. sudo su 3. apt install bc module-assistant build-essential dkms 4. m-a prepare 5. apt install rtl8821ce-dkms