-----Original Message-----
>From: Pascal Hambourg 
>Sent: Nov 19, 2017 11:03 AM
>To: "debian-user@lists.debian.org" 
>Subject: Re: Installer Can Not Find Root
>
>Le 19/11/2017 à 03:26, Dan Norton a écrit :
>> 
>> Using LVM, one physical volume is defined on the entire sda5 partition. A volume
>> group named "debian8-vg" is defined as the only vg in that pv. Five logical
>> volumes have been defined in the vg. One lv intended as root was defined like
>> this with a Debian Live CD:
>> 
>> user@debian:/$ sudo lvm lvcreate -n root --size 8G debian8-vg  #define lv named root
>> user@debian:/$ sudo mkfs.ext4 /dev/debian-vg/root  #make a file system in lv root
>
>You did not have to do this with a live CD command line. You could have 
>done it with the Debian installer partitioning interface.
>
>> user@debian:/$ sudo mount /dev/debian-vg/root
>
>The mount point is missing. Besides, why did you mount the filesystem ?
>
>>  #the "/root" was dropped apparently
>
>What do you mean ?
> 
Simply that
sudo mount /dev/debian-vg/root
was processed as
sudo mount /dev/debian-vg
>> There they are. All the logical volumes. Am I getting close? How can I "mkdir /"
>> on root and succeed with netinst? BTW I did choose Manual partitioning in the
>> installer. :-(
>
>You do not have to do anything with the command line. In the manual 
>partitioning main panel showing all disks, partitions and volumes, just 
>select a logical volume, edit its settings and select a mount point.
>
OK, in the installer, logical volumes selected and mount points defined for /, /home, swap, /tmp, and /var.
Thank you, Pascal. That's progress.
Now I have a problem with the EFI partition. I made several attempts with primary partitions. The last is:
#1  primary  1.0MB     F  fat32  /dos
#2  primary  8.6GB  B  K  ESP 
"The attempt to mount a file system with type vfat in SCSI1 (0,0,0), partition #2(sda) at /boot/efi failed."
The goal is to multiboot with grub among several Debian partitions. I've been reading [1] and [2]. Are there better references for me to study?
[1] https://www.debian.org/releases/jessie/installmanual
[2] https://www.debian.org/releases/jessie/amd64/