Better feedback when partitioning during installation and all 4 primary partitions are in use

[Adam]

 affects ubuntu

During the installation procedure from a Live USB disk, I was installing
Linux on a hard drive with Windows. During the partitioning step, I chose
"something else" to keep Windows. Although I had already made extra
unpartitioned space for Linux, it showed this space as "unusable" and
wouldn't let me choose it for installation. The reason turned out to be
that Windows was already using all 4 primary partitions, which is the
maximum allowed for an MBR partitioning scheme, so I had to delete one.

It would be good for the installer to inform users that this is the reason
the unpartitioned space is unusable, rather than just greying out the
button to create a partition there. New users might not be able to figure
this out, and might not know about the 4 partition limit. This issue is
important so that installation is as clear and easy as possible so that
people won't be scared away from switching to Linux.

Technically I was installing Linux Mint, but Mint takes this partitioning
dialog from Ubuntu, so the issue exists for Ubuntu too.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1910434/+editstatus and add the package name in the text box next to the word Package.

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