Further update: Problem appears tide to the single command in the postinstallation script not actually existing, to wit:
/usr/sbin/plymouth-set-default-theme --rebuild-initrd xubuntu-logo
<em>There is no /usr/sbin/plymouth-set-default-theme.</em> (In fact, this has a #FIXME comment just above)
Further update: Problem appears tide to the single command in the postinstallation script not actually existing, to wit:
/usr/sbin/ plymouth- set-default- theme --rebuild-initrd xubuntu-logo
<em>There is no /usr/sbin/ plymouth- set-default- theme.< /em> (In fact, this has a #FIXME comment just above)