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Does anybody have an idea why this is not working?

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    $\begingroup$ The only time this happened to me was when I was customizing some keyboard shortcuts a while back. Have you tried 'File -> Load Factory Settings' $\endgroup$
    – MarcClintDion
    Commented Feb 9, 2015 at 11:26
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    $\begingroup$ Welcome to SE Toran! It's a little hard to understand what might be wrong from the little information you've provided - could you edit the question and add some info like: Your OS, version of Blender, a screenshot of the whole interface after you try selecting it, etc. You can also double check that your GPU drivers are up to date, and that you downloaded Blender from blender.org and not from one of the linux repositories (these can be unreliable). $\endgroup$
    – Greg Zaal
    Commented Feb 9, 2015 at 12:22
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    $\begingroup$ I assume you meant Alt+RMB? $\endgroup$
    – J Sargent
    Commented Feb 9, 2015 at 12:25
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    $\begingroup$ @Toran you need to use the right click. $\endgroup$
    – ruckus
    Commented Feb 9, 2015 at 15:35
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    $\begingroup$ @Toran sorry you lost 3.5 hours of work, but what were you thinking not saving for 3.5 hours? $\endgroup$
    – David
    Commented Feb 9, 2015 at 16:20

5 Answers 5

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Alt key in most Linux window managers doesn't work properly with blender. You can configure it in various window managers, but the easiest solution for me is to shift+alt click. It will select an edge loop, but its in a "additive mode" so it works for selecting 1 edge loop, and continues selecting edge loops as if you are shift selecting multiple items.

Sorry if this text description is confusing, but try shift+alt click on the edge loop and it should achieve what you want.

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    $\begingroup$ In Cinnamon you can go to System Settings > Windows > Behavior. It's the entry called "Special key to move and resize windows". $\endgroup$
    – Clox
    Commented Jan 18, 2018 at 9:57
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    $\begingroup$ Neither ALT-click or SHIFT-alt click works (Ubuntu 18.04). $\endgroup$
    – Kris
    Commented Aug 9, 2020 at 3:54
  • $\begingroup$ Shift+Alt+Click works for me on Ubuntu Mate/XFCE 20.04 without any modifications :) $\endgroup$
    – Subhamoy S.
    Commented Nov 24, 2020 at 9:45
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In most Linux OS's, the window action key is alt which conflics with many Blender shortcuts the most noticable of which is the alt->click edge loop short cut.

It can be harder to fix this problem than some of the other conflicting hotkeys because it isn't actually in the keyboard hotkeys menu.

In most OS's it's in the window resizing settings panel. In the cinnamon and xfce window managers, this is found in the normal settings manager or can also be found by searching for it. In the GNOME window manager, it can be found in the GNOME Tweak Tool under windows.

All you have to do is locate the window action key, or basically a drop down menu that by default has alt in it. Just change this to something like super, or in GNOME, you can change it to disable like I have it.

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I just found out (after reading about resetting to defaults) that(in my) Blenderversion 2.76b the edgeloop- selection command does not work when 3- button mouse emulation is enabled. I hope that helps, I was searching like hell! ;)

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Blender 2.78c but I'm sure it would be a general thing:

User Preferences > Input > Shortcut list > 3D View > Mesh

  1. Loop Select (1) Change Mouse to Keyboard
  2. Change shortcut to Alt+A
  3. Loop Select (2) Change Mouse to Keyboard
  4. Change shortcut to Shift+Alt+A
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  • $\begingroup$ Even though this is not the correct solution, in the end I found it to be the most useful. $\endgroup$
    – Tiagojdferreira
    Commented Nov 13, 2017 at 23:08
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This has been up for awhile, but when looking for a correct answer, for me, I found that Tom's answer is correct. In my case, I am using Arch Linux with a xfce desktop. So to extend on Tom's answer, I found the fix by going to Settings > Window Manager Tweaks > Accessibility (tab): Here there is a drop down "Key used to grab and move windows". I switched it from Alt to Super and the problem was fixed.

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    $\begingroup$ In Linux Mint it's similar: System Settings > Windows > Behavior Then disable Alt key from the "special key to move and resize windows" field. $\endgroup$
    – PoxBox
    Commented Apr 10, 2018 at 19:23
  • $\begingroup$ Above did the trick for me too in Linux Mint 19.1 Tessa. $\endgroup$
    – Marek Podyma
    Commented May 4, 2020 at 23:46
  • $\begingroup$ As I came here with the same problem but KDE - I eventually found the setting for Plasma 5.20 in: Windows Management->Window Behavior->Window Actions and not in shortcuts as I first tought. $\endgroup$
    – Eike
    Commented Jan 2, 2021 at 20:24
  • $\begingroup$ Thanks for sharing this. I am using Manjaro and xfce, and so this was the perfect answer for me. $\endgroup$
    – R-800
    Commented Sep 8 at 5:50

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