Here's another close match: If something has been done about the visible symptoms of a problem, but not the true problem, you can say that the problem has been papered over. The implicit analogy is to a badly damaged wall which has been covered with wallpaper, rather than fixing it properly.
This is similar to “put a Band-Aid on [a problem],” but harsher in its implications. Soap, water, and an adhesive bandage are sufficient treatment for a minor wound, are better than nothing for a major wound, and they don't hide the existence of the wound. Putting wallpaper over a damaged wall, on the other hand, only hides the damage, and makes it hard to tell whether the damage is continuing to get worse. So, “put a Band-Aid on” connotes an inadequate solution for the problem, but one that may have been the best anyone could do at the time, and intended only to stabilize the situation until there are time and resources for a proper fix. "Paper over" connotes that whoever is in charge does not care about a proper fix, only about appearances and short-term costs.
[Footnote: in American English, “Band-Aid” is a genericized trademark, used to refer to any sort of adhesive bandage. The generic term for adhesive bandages in your native language is probably different.]