Public bug reported:
In the file /lib/partman/init.d/30parted the $path (which is a
partition, NOT a device) is checked to see if it matches the beginning
of $line (which contains the list of devices from the command
"parted_devices"). Then, if a match is found, it is later checked if
this is mounted to "/cdrom", and if so it is later "dropped" IF it is
determined that the free space on the drive is less than 16777216.
There are a few problems with this approach, which I attempt to rectify
in the attached patch:
1. Since parted_devices lists "/cdrom" to a device (/dev/sdb) not to a
partition (/dev/sdb1) but $path is always a partition (/dev/sdb1,
/dev/sdb2, etc.) then no match is ever made, and thus /cdrom is never
checked to be excluded.
2. I suggest that at any time the device containing "/cdrom" should be
excluded, not only if it has more freespace than 16777216. The reason
is that newer releases of usb-creator-gtk and other tools such as mkusb
will leave the remainder of the disk as "free", meaning that if you
write the installer to a 32GB thumbdrive, it will then have enough
freespace that makes partman think it is a good candidate for
installation. But I don't think it likely that a user will ever want to
install to the device containing the livecd (/cdrom) and if they do,
then they can go to the "something else" advanced partitioning to
specify so.
The real bug may be that on ubiquity's partition selection screen (NOT
the advanced "something else") that it sees the MAIN hard drive
(/dev/sda), and prompts to install side by side but then when clicking
that option the installer USB (/dev/sdb) is selected as the target, it
is partitioned, and confusion ensues.
Regardless, the above points are fixed with the attached patch so I hope
you will consider including it. This was written against Ubuntu 18.04
ubiquity 18.04.14.12.
I will add /var/log/syslog and /var/log/partman of the problem (using
our remastered installer) to hopefully make it more clear.
** Affects: ubiquity (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "patch for 30parted"
https://bugs.launchpad.net/bugs/1822743/+attachment/5251953/+files/30parted-remove-cdrom-device.patch
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https://bugs.launchpad.net/bugs/1822743
Title:
partman: needs to ignore entire /cdrom device
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