fde.md: Clarifying base-system installation.

Making clearer to the reader that the actual installation command should
use the appropriate URL, also separating GRUB installation and
configuration from the base-system section to make the installation
procedures (chroot and fde) more consistent, making easier to mention
one single source to avoid repetition.

src/installation/guides/fde.md

@@ -122,27 +122,9 @@ On a UEFI system, the EFI system partition also needs to be mounted.
 
 Before we enter the chroot to finish up configuration, we do the actual install.
 
-`xbps-install` might ask you to [verify the RSA
-keys](../../xbps/troubleshooting/common-issues.md#verifying-rsa-keys) for the
-packages you are installing.
-
-```
-# xbps-install -Sy -R https://alpha.de.repo.voidlinux.org/current -r /mnt base-system lvm2 cryptsetup grub
-[*] Updating `https://alpha.de.repo.voidlinux.org/current/x86_64-repodata' ...
-x86_64-repodata: 1661KB [avg rate: 2257KB/s]
-`https://alpha.de.repo.voidlinux.org/current' repository has been RSA signed by "Void Linux"
-Fingerprint: 60:ae:0c:d6:f0:95:17:80:bc:93:46:7a:89:af:a3:2d
-Do you want to import this public key? [Y/n] y
-130 packages will be downloaded:
-...
-```
-
-UEFI systems will have a slightly different package selection. The installation
-command for a UEFI system will be as follows.
-
-```
-# xbps-install -Sy -R https://alpha.de.repo.voidlinux.org/current -r /mnt base-system cryptsetup grub-x86_64-efi lvm2
-```
+Follow the instructions on [Base Installation](chroot.md#base-installation) to
+install the `base-system` and, additionally, the other important packages we
+need in this specific case, those are: `lvm2` and `cryptsetup`.
 
 When it's done, we can enter the `chroot` and finish up the configuration.
 
@@ -174,26 +156,6 @@ UEFI systems will also have an entry for the EFI system partition.
 /dev/sda1	/boot/efi	vfat	defaults	0	0
 ```
 
-Next, configure GRUB to be able to unlock the filesystem. Add the following line
-to `/etc/default/grub`:
-
-```
-GRUB_ENABLE_CRYPTODISK=y
-```
-
-Next, the kernel needs to be configured to find the encrypted device. First,
-find the UUID of the device.
-
-```
-# blkid -o value -s UUID /dev/sda1
-135f3c06-26a0-437f-a05e-287b036440a4
-```
-
-Edit the `GRUB_CMDLINE_LINUX_DEFAULT=` line in `/etc/default/grub` and add
-`rd.lvm.vg=voidvm rd.luks.uuid=<UUID>` to it. Make sure the UUID matches the one
-for the `sda1` device found in the output of the
-[blkid(8)](https://man.voidlinux.org/blkid.8) command above.
-
 And now to avoid having to enter the password twice on boot, a key will be
 configured to automatically unlock the encrypted volume on boot. First, generate
 a random key.
@@ -233,12 +195,35 @@ a new file at `/etc/dracut.conf.d/10-crypt.conf` with the following line:
 install_items+=" /boot/volume.key /etc/crypttab "
 ```
 
-Next, install the boot loader to the disk.
+Now we will configure our bootloader, see the instructions on [Installing
+GRUB](chroot.md#installing-grub) to install the correct GRUB package for your
+system, but do not install it on the disk just yet (with `grub-install`) as we
+will need to modify it's configuration before doing so.
+
+After installing the correct GRUB package, configure GRUB to be able to unlock
+the filesystem. Add the following line to `/etc/default/grub`:
+
+```
+GRUB_ENABLE_CRYPTODISK=y
+```
+
+Next, the kernel needs to be configured to find the encrypted device. First,
+find the UUID of the device.
 
 ```
-# grub-install /dev/sda
+# blkid -o value -s UUID /dev/sda1
+135f3c06-26a0-437f-a05e-287b036440a4
 ```
 
+Edit the `GRUB_CMDLINE_LINUX_DEFAULT=` line in `/etc/default/grub` and add
+`rd.lvm.vg=voidvm rd.luks.uuid=<UUID>` to it. Make sure the UUID matches the one
+for the `sda1` device found in the output of the
+[blkid(8)](https://man.voidlinux.org/blkid.8) command above.
+
+Next, install the bootloader onto the disk using the correct `grub-install`
+command for your system, as stated on [Installing
+GRUB](chroot.md#installing-grub).
+
 Ensure an initramfs is generated:
 
 ```