I had the inevitable request to do something with an aging PC running XP, so I put Lubuntu on it (on a separate drive).
However, there were some issues when displaying icons and highlighted text. Running the file manager, some directories and files would come up with icons and some would not. Hovering the mouse over where the icon should be would sometimes show the icon for that item, but then an icon (or 2) might disappear for other items. There didn't appear to be any consistency.
In addition, the highlighted text in the left hand pane of the file manager didn't have a background colour of the selected item and as the text is normally white, there was just a faint green "shadow" on the text, meaning it was difficult to read. This seemed to happen on other dialogs as well - because I went to change the theme / window decorations to see if that would help and it didn't seem to. At this stage I was running out of time, so didn't go into things too deeply.
As it was, I had to leave it and the PC is back to XP for now (yeah, I know).
I don't know what CPU spec this thing had, but it's a 12 year old Dell Dimension, with 1GB RAM. I thought that would be enough to run Lubuntu, so am a bit perplexed by the display issues.