He lived with a similar problem for quite a long time, but today he finally decided to figure out what was the matter.
It turned out that the problem is in the gsfonts-x11 package — you just need to remove it. I don’t remember that I put it on my own, so I assume that it is installed by default in the distributor, which means that the problem is familiar to many. For example, opera.com fonts look awful.
The gsfonts-x11 package makes available postscript fonts in x11, prescribing adobe official names as aliases, for example, adobe helvetica. I suppose that for the painless removal of this package, you need to install the appropriate TTF-fonts, for example, take it from Windows. I had them installed earlier, so I don’t know what will happen without them. ')
UPD Who has not helped, in the comments still advise: > you need to uncheck Enable Core X Fonts: opera: config # UserPrefs | EnableCoreXFonts
PS I have a problem on xkcd.com - the Lucida font is used there. The Opera version is 10 beta.