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Assuming you left the root account disabled (as is the default),
you'll have to:
1) boot the Qubes install media
2) switch to unused TTY by pressing Ctrl+Alt+F<number>
3) determine which /dev/sdX device is the one containing your Qubes
installation (eg. using `lsblk`; next steps assume it's /dev/sdb)
4) run `cryptsetup luksOpen /dev/sdb2 qubes` to unlock the encrypted
root drive
5) `mount /dev/mapper/qubes /mnt`
6) `chroot /mnt`
7) `passwd user` (where "user" is your Qubes login)
8) type in a new password and confirm
9) press Ctrl+D
10) type `reboot`
Cheers,
Patrik
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