Beamer error on Lyx

jcredberry at jcredberry at
Mon Aug 24 15:14:39 UTC 2020

Yes Paul, it is. This is the same set of slides I use every year. No
changes except for homework. I have opened the file in my Mac with Lyx
2.3.1-1 after saving it in Windows, and at compiling time the same error

! Package inputenc Error: Keyboard character used is undefined

(inputenc) in inputencoding `latin9'.

Again, this is a document that I have used for at least a couple of years
in its current state. Only minor changes have been made. When I manually
changed the encoding to UTF-8, it worked flawlessly. I tried opening other
Beamer files that I have not opened in Windows and they even work without
changing the encoding.

I think something bad happened while working on my file in Windows that has
permanently damaged it. I hope this is not something that can break down
the workflow for the ones who work in different OS´s.

Julio Rojas
jcredberry at

On Mon, Aug 24, 2020 at 10:04 AM Paul A. Rubin <parubin73 at> wrote:

> On 8/23/20 7:27 PM, jcredberry at wrote:
> Dear all,
> Trying to open a Beamer presentation that I used for my lectures every
> year. After some adjustment for this year's lectures, the following error
> appears when compiling the document:
> ! Package inputenc Error: Keyboard character used is undefined
> (inputenc) in inputencoding `latin9'.
> This is a document that I usually work with on Ubuntu Linux, but that in
> this case, I opened in Windows 10.
> I changed default coding to UTF-8 instead of inputenc and another error
> appears. In this case, the small logo in the right corner is not recognized
> and as the filename is "uct_logo.png", at compilation time it says the file
> is not found and then a box with "uct_logo" appears, with the "l" in "logo"
> as a subscript.
> Is this problem a Windows or a Lyx related one? BTW, I am using TeXLive
> 2019 on this windows computer.
> Regards,
> Julio Rojas
> jcredberry at
> Is the logo PNG file in the same directory as the LyX file? If not, have
> you tried specifying the path to it?
> Paul
> --
> lyx-users mailing list
> lyx-users at
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