Могу ли я выбрать положение раздела при установке Ubuntu в качестве двойной загрузки с Windows?

sudo passwd root

# put the information we need in variables
username=...
old_uid=`id -u $username`  # looks up current (old) uid
new_uid=...

# update the user ID and group ID for $username
usermod -u $new_uid $username
groupmod -g $new_uid $username

# update the file ownerships
# NB: you cannot combine the next two chowns, or files where 
# only the uid xor the gid matches won't be updated  
chown -Rhc --from=$old_uid $new_uid /    # change the user IDs
chown -Rhc --from=:$old_uid :$new_uid /  # change the group IDs

sudo passwd -dl root