mouse cursor is invisible after installation of 32 bit Xubuntu 14.04.3; 15.04, 15.10 betas and daily image

[Kafshiel]

Bug: Mouse cursor/pointer is invisible after an installation and reboot of Xubuntu i386 14.04.2, 14.04.3 and 15.04. The same happens after installation and reboot of Ubuntu i386 15.04 (didn't try other versions). The mouse is still there because we can see it act on the corner whiskermenu, and when it passes over the menu entries or the xfce panel icons but it's invisible, so it's not possible to use the system to report the bug via the terminal tools. The mouse pointer works perfectly in all the live sessions and even during installation. It's only after rebooting that the pointer disappears (trackpad or mouse it's the same).
I was using Linux Mint 17.2 on my work/stable partition but decided to test Xubuntu on my sda3 test partition and went through all the installations that I referred above.
Verified that the bug doesn't occur when installing Xubuntu 14.04. and Ubuntu 14.04. But at versions 14.04.2, 14.04.3, then 15.04, the bug is there.
Could it be from the particular hardware configuration I'm using? CPU: Intel Atom N455 @1.66 Ghz (1 core, 2 threads); RAM: 1 Gb; GPU: Intel GMA 3150 (integrated, shared memory, own memory=64 Mb). This Acer Aspire One 260 notebook is from 2010.
But Linux Mint Xfce 32bit 17.1 and 17.2 ISO's do not have this bug at all.
What I found out: in one installation of Xubuntu 14.04.3 I managed to get the mouse pointer back by using the reaction to the mouse over in the Settings menu to go to Mouse and Touchpad settings and there, with a lot of luck I was able to change the default theme to the DMZ Black theme and got the mouse pointer back. Of course I forgot to file the bug report (sorry!) because I then was trying to fix it and installed the oxygen-mouse-cursor, via Synaptic, then selected oxy-white as default cursor. But the oxy-white cursor only appears inside some apps and setting screens, like Firefox, Synaptic, etc. On the desktop it reverted back to DMZ-Black. I noticed that the default mouse cursor preview field, in Mouse & Touchpad settings is empty, doesn't show any preview at all. Then I discovered that in "/usr/share/icons/default" there is only a symlink called "index.theme", which contains this text: "[Icon Theme] Inherits=DMZ-White" and links to "/etc/alternatives/x-cursor-theme", which is another (!?) symlink file that links to "/usr/share/icons/DMZ-White/cursor.theme" and contains the same "[Icon Theme] Inherits=DMZ-White" text. Update: when Xubuntu 15.10 final release came out I tried to install it from the ISO but disconnected the USB mouse during installation. So after the first reboot the mouse was there. Before shuting down or rebooting again, I made sure I changed the mouse theme from "Default" to DMZ White (any of the other themes will work) and, since then, the mouse pointer is there. However when I install oxygen-cursors-theme and select any of the oxygen cursors as my default mouse the oxygen mouse pointer is only visible inside some apps and system screens. On the desktop it reverts to DMZ-White. So this is actually a bug but I don't know how to file it because it's not from the mouse cursor packages.

[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/1507201/+editstatus and add the package name in the text box next to the word Package.

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[Kafshiel (kafshiel)]

Xubuntu 15.10 32 bit Final Release has a mouse pointer after the end of installation reboot. Just to make sure it wouldn't go away I installed oxygen-cursor-theme and changed the mouse pointer, but I think that just selecting one of the included mouse pointers, including DMZ White, is enough to have the mouse back after the second boot. Just don't leave it in the "Default" setting (where the default theme preview is empty) before you shutdown or reboot.
It seems that so far I'm the only one complaining about this bug so I would agree it has a very low importance but it still happens with the Xubuntu/Lubuntu/Ubuntu 14.04.2 and 14.04.3 32 bit ISO's. So it's an Ubuntu core bug. It doesn't affect any of the x86_64 iso's, only the 32 bit versions, I've tried installing with Xubuntu 14.04.2 and 14.04.3 x86_64 ISO's and there were no problems. It's just that I have an older netbook with 1 GB RAM and so I have to use the 32 bit versions.

[Kafshiel (kafshiel)]

The mouse pointer/cursor still disappears sometimes after boot. I have to reboot to get it back. Xubuntu won't remember my choice for the default mouse. I tried oxy-white and other oxygen pointers to no avail (they only work for the current session, after you reboot you get DMZ-White again or the invisible mouse!). I tried selecting DMZ-White/Black to no avail. If I choose oxy-white as my default cursor it should just be there and work. Ditto. I then proceeded to examine usr/share/icons/default/index.theme (you don't have folder context menu to open as admin like Linux Mint so "sudo mousepad /usr..., etc) and found out that it gives 6 Theme parsing errors for that file: "gtk.css:27:35: junk at the end of file" and 5 more where just the numbers change (the next is 40:48: etc...). I edited that file from "[Icon Theme] Inherits=DMZ-White" to [Icon Theme] Inherits=oxy-white and now I'm gonna see what happens. This has automatically changed the symlink at /etc/alternatives/x-cursor-theme to reflect the new oxy-white choice as default (it's now also [Icon Theme] Inherits=oxy-white) Those parsing errors shouldn't be there. Remember that my Xubuntu version is 15.10 wily i386 (32 bit). I have a screenshot of these steps, which includes all 6 Theme parsing errors but I'm trying to take a screenshot of the invisible mouse, which I think will be more useful because it will prove that the bug indeed happens. I changed the target to xubuntu daily builds to see if the bug is caught and solved before 16.04. I also decided that x-cursor-theme should be the package, although it seems more like a configuration problem. Thanks.