I have Linux Mint 17.3 which was originally installed with the Cinnamon desktop. I am wanting to install MATE and switch to that instead, and used a guide to do so. The last step is to "click on the lambda" button in the upper-right corner of the login screen, which then pops up with a selector:

Linux Mint Select a session

However, this doesn't work for me. Instead of a lambda, I see the letters "ci". When I click on it, nothing happens. I can log in, click on the power icon in the upper left, and navigate through the slideshow, but not this. Here is what I see:

Linux Mint Login Screen

I know that I have MATE properly installed because when I run apt-get install mint-meta-mate from the command line, I am told that I already have the latest version.

How can I get the login screen session icon to work so that I can switch to MATE? If I can't do anything, is there an alternate way to switch?

Edit: I turned off the login window preference to always choose the last user, and that changed the ci icon into a gear. Still can't click on it though.

enter image description here


According to this link, the default login window theme does not support changing desktop environments. Switching from the Mint-X theme to Linux Mint GDM should resolve the issue.

The theme can be changed at:

Menu -> Administration -> Login Window -> Theme

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