Cubic Experimental - Ubiquity crashes during installation of a customized ISO

[PJSingh5000]

The Ubiquity installer crashes when it is almost done installing from an ISO generated using Cubic Experimental.

The issue occurs during the Apt Setup step as show in the following /var/log/syslog excerpt:

May 23 03:22:43 ubuntu ubiquity: /proc: mount point does not exist.
.
.
.

May 23 03:22:53 ubuntu ubiquity: /proc: umount failed: No such file or directory.
.
.
.

May 23 03:22:53 ubuntu ubiquity: /target/etc/apt/sources.list
May 23 03:22:53 ubuntu ubiquity: : No such file or directory
May 23 03:22:53 ubuntu ubiquity:
May 23 03:22:53 ubuntu /plugininstall.py: Exception during installation:
May 23 03:22:53 ubuntu /plugininstall.py: Traceback (most recent call last):
May 23 03:22:53 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1767, in <module>
May 23 03:22:53 ubuntu /plugininstall.py: install.run()
May 23 03:22:53 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 62, in wrapper
May 23 03:22:53 ubuntu /plugininstall.py: func(self)
May 23 03:22:53 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 190, in run
May 23 03:22:53 ubuntu /plugininstall.py: self.configure_apt()
May 23 03:22:53 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 596, in configure_apt
May 23 03:22:53 ubuntu /plugininstall.py: raise install_misc.InstallStepError(
May 23 03:22:53 ubuntu /plugininstall.py: ubiquity.install_misc.InstallStepError: AptSetup failed with code 1

[Cubic PPA (cubic-wizard)]

Cubic excluded the /proc and /tmp directories from the compressed Linux file system on the customized ISO.

However, these directories are required by Ubiquity and are not automatically recreated during the installation process.

Cubic now includes the following *empty* directories:

    /proc
    /tmp
    /run

(The /run directory was always present, but it is now and empty directory).

Additionally, Cubic now excludes the /swapfile from the compressed Linux file system, since it is created by the OS.

[Cubic PPA (cubic-wizard)]

Fixed in version 2020.05-22 of Cubic Experimental.