I encounter the same issue on natty.
I use a slightly different way to select the font (in case it matters). I use
(setq my-default-font "-unknown-UbuntuBeta Mono-normal-normal-*-14-*-*-*-*-0-iso10646-1")
which ultimately ends up in default-frame-alist
Note that I previously used:
(setq my-default-font "-unknown-Ubuntu Beta Mono 21-normal-normal-*-14-*-*-*-*-0-iso10646-1")
Deleting the bold-italic font from /usr/share/fonts/truetype/ubuntu-font-family made it work again, so +1 on the workaround.
I encounter the same issue on natty.
I use a slightly different way to select the font (in case it matters). I use
(setq my-default-font "-unknown- UbuntuBeta Mono-normal- normal- *-14-*- *-*-*-0- iso10646- 1")
which ultimately ends up in default-frame-alist
Note that I previously used:
(setq my-default-font "-unknown-Ubuntu Beta Mono 21-normal- normal- *-14-*- *-*-*-0- iso10646- 1")
Deleting the bold-italic font from /usr/share/ fonts/truetype/ ubuntu- font-family made it work again, so +1 on the workaround.