Comment 0 for bug 1829643

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### NOTE English is not my native language, I do my best ...
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Distribution is Lubuntu (Ubuntu-19.04).

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### NOTE by request
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# cat /proc/version_signature
Ubuntu 5.0.0-15.16-generic 5.0.6

# apt-cache policy cups
cups:
  Installed: 2.2.10-4ubuntu1
  Candidate: 2.2.10-4ubuntu1
  Version table:
 *** 2.2.10-4ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu disco-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.2.10-4 500
        500 http://archive.ubuntu.com/ubuntu disco/main amd64 Packages

# lsb_release -rd
Description: Ubuntu 19.04
Release: 19.04

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### NOTE starting point
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My printing system for the last 12-15 years based on cups had/has the following setup:

* 1 network laser printer "Brother MFC 9142CDN"
* 3 "symbolic" printers which are copies of the former, configured to set defaults for particular uses: "monoprinter" (grayscale), "colorprinter" (full color) and "labelprinter" (use of manual feed)

The "Brother MFC 9142CDN" was instantly discovered and completely PPD configured and successfully tested with a fresh Lubuntu-19.04 install, last week.

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### NOTE by request: see attachment for "ubuntu-bug cups" output
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### NOTE After first install and fresh configuration my printer setup looks as follows
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# lpstat -s
device for Brother_MFC_9142CDN: ipp://BRN30055C78CF3B.local:631/ipp/print
device for colorprinter: ipp://BRN30055C78CF3B.local:631/ipp/print
device for labelprinter: ipp://BRN30055C78CF3B.local:631/ipp/print
device for monoprinter: ipp://BRN30055C78CF3B.local:631/ipp/print
# ls -l ppd/
total 96
-rw-rw-r-- 1 root lp 8619 May 12 18:07 Brother_MFC_9142CDN.ppd
-rw-rw-r-- 1 root lp 8619 May 12 18:07 Brother_MFC_9142CDN.ppd.O
-rw-r----- 1 root lp 8617 May 17 21:00 colorprinter.ppd
-rw-r----- 1 root lp 8635 May 17 20:56 colorprinter.ppd.O
-rw-r----- 1 root lp 8622 May 17 21:05 labelprinter.ppd
-rw-r----- 1 root lp 8622 May 17 21:01 labelprinter.ppd.O
-rw-r----- 1 root lp 8620 May 17 20:59 monoprinter.ppd
-rw-r----- 1 root lp 8635 May 17 20:58 monoprinter.ppd.O

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### NOTE Only the first of these (Brother_MFC_9142CDN) survives a reboot
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# lpstat -s
device for Brother_MFC_9142CDN: ipp://BRN30055C78CF3B.local:631/ipp/print

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### NOTE strangely, this one also disappears after some minutes
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LANG=en lpstat -s
no system default destination
lpstat: No destinations added.
lpstat: No destinations added.

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### NOTE printers.conf / printers.conf.O - mind the sizes
###
### printers.conf: no printer definition, just standard comment "DO NOT EDIT ..."
### printers.conf.O: only the physical network printer "Brother_MFC_9142CDN" description
### while the 3 other printers (monoprinter, colorprinter, labelprinter) are missing
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# ls -l /etc/cups/printers.conf*
-rw------- 1 root lp 111 Mai 19 08:00 printers.conf
-rw------- 1 root lp 923 Mai 19 07:55 printers.conf.O

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### NOTE the PPDs are also lost at this time
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# ls -l /etc/cups/ppd/
total 0

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### NOTE after my fresh and working configuration, the PPDs looked like this
###
### Only the "Brother_MFC_9142CDN" survives a reboot though it also disappears later.
### Mind the permissions: 664 versus 640 ... don't know why
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# ls -l ppd/
total 96
-rw-rw-r-- 1 root lp 8619 May 12 18:07 Brother_MFC_9142CDN.ppd
-rw-rw-r-- 1 root lp 8619 May 12 18:07 Brother_MFC_9142CDN.ppd.O
-rw-r----- 1 root lp 8617 May 17 21:00 colorprinter.ppd
-rw-r----- 1 root lp 8635 May 17 20:56 colorprinter.ppd.O
-rw-r----- 1 root lp 8622 May 17 21:05 labelprinter.ppd
-rw-r----- 1 root lp 8622 May 17 21:01 labelprinter.ppd.O
-rw-r----- 1 root lp 8620 May 17 20:59 monoprinter.ppd
-rw-r----- 1 root lp 8635 May 17 20:58 monoprinter.ppd.O

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### NOTE
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### Apart from the different settings in "/etc/cups/printers.conf" for my 3 copies,
### the DeviceURI is the same for all four. Only the UUID differs
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<Printer Brother_MFC_9142CDN>
UUID urn:uuid:f81a64b6-71d2-3878-71cf-1b1fd6b4dba3
DeviceURI ipp://BRN30055C78CF3B.local:631/ipp/print
</Printer>
<Printer colorprinter>
UUID urn:uuid:63efeecc-be6e-3065-6c0c-9a73bdd0dd62
DeviceURI ipp://BRN30055C78CF3B.local:631/ipp/print
</Printer>
<Printer labelprinter>
UUID urn:uuid:756313d5-4548-327f-666b-9f2edf2c8942
DeviceURI ipp://BRN30055C78CF3B.local:631/ipp/print
</Printer>
<DefaultPrinter monoprinter>
UUID urn:uuid:c4abcfb1-c1f2-34fd-4e8f-514209e3e5e9
DeviceURI ipp://BRN30055C78CF3B.local:631/ipp/print
</DefaultPrinter>