Problems with Ubuntu font

Hi all,
Since yesterday I'm having trouble with the Ubuntu font family - Creative Cloud App first showed some sort of font conflicts and then failed to process the font styles during re-upload.

Here's a more detailed description of what happened:

We are using the Ubuntu Font Family (it's a Google font) as standard for all our marketing collaterals. Since yesterday, I have problems in Photoshop regarding that font. When opening an older PSD file there was a notification that it had to replace the font. That seemed still to work and show the text in Ubuntu font nevertheless. Problems occured when I started editing or adding new text and wanted the font style to change into medium or bold. I could select these font styles from the font drop down menu but it automatically reset everything to light instead. The only font style which seemed to work properly was regular.

I then looked it up in the Creative Cloud App and noticed that there was some kind of font conflict displayed for all Ubuntu font styles except regular. I then deactivated all Ubuntu fonts completely and downloaded the Ubuntu Google font again. When trying to add it to the font library in the Creative Cloud App, however, it fails to process these fonts. The funny thing is, that for the regular style it's different from the rest again. Although deactivated from the Creative App Font Manager it is displayed as "already on device" (see attachment).

Can anyone help me out here? I've even renamed the ttf files into "Ubuntu2" to see if this might be changing anything but it didn't help at all.

BTW - not sure if this is of interest or has anything to do with it: Until yesterday, I used Photoshop 2019 for editing / creating creatives (because it was pinned to my task bar). Yesterday, I opened Photoshop 2021 for the first time. But since this font issue seems to a general problem also shown in the Creative Cloud, this should not account for the problem, I assume...

I'd be very grateful for any support as our IT department is at loss, too.

Thanks,
Anja

P.S.: I'm working on a Windows PC.