I installed Xubuntu when running a persistent live Ubuntu system

1. With the options 'toram' 'nopersistent'

It was truly live-only (and the installation worked).

2. With the default settings (no extra boot option compared what comes
with the iso file)

The casper-rw partition received and stored an install log (and the
installation worked).

---
tester@tester-SATELLITE-PRO-C850-19W:~$ sudo lsblk -f
NAME   FSTYPE  LABEL                   UUID                                 
FSAVAIL FSUSE% MOUNTPOINT
sda                                                                             
           
├─sda1 vfat                            9B34-A9E8                                
           
├─sda2 ext4                            aee3c5e5-e695-49e9-9598-ac8671f30181     
           
├─sda3 ext4                            cf57ee56-dba4-4494-9475-07af55933ac3   
16,2G    25% /
└─sda4 ext4                            e1ce9f48-8214-4cae-ba35-c4a62f7f6d78     
           
sdb                                                                             
           
├─sdb1 ntfs    usbdata                 0B539A8875BBB7D6                         
           
├─sdb2                                                                          
           
├─sdb3 vfat    usbboot                 112D-C9F8                                
           
├─sdb4 iso9660 Xubuntu 20.04 LTS amd64 2019-11-10-02-05-43-00                   
           
└─sdb5 ext4    casper-rw               28567df4-354c-4061-ae21-431c30d01939     
           
sr0                                                                             
           
tester@tester-SATELLITE-PRO-C850-19W:~$ sudo mount /dev/sdb5 /mnt
tester@tester-SATELLITE-PRO-C850-19W:~$ sudo du -hs /mnt/*
1,4M    /mnt/install-logs-2019-11-10.0
16K     /mnt/lost+found
43M     /mnt/upper
8,0K    /mnt/work
tester@tester-SATELLITE-PRO-C850-19W:~$ 
---

I realize that this is a useful feature and not a bug.

But as stated earlier, this is new territory, and I think some of us,
who use live and persistent live drives may have problems to use drives
with this new feature. So it would still be valuable to get a
modification such that 'toram' alone will turn off saving log files to
the casper-rw partition and make it possible to unmount it.

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https://bugs.launchpad.net/bugs/1851123

Title:
  Ubuntu 19.10 and focal live cloned create and mount casper-rw
  partition

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