As Fred says, you can also use the official 1.5.3 build under Ubuntu as I do (the setup is able to install the version of exe which runs ok under Linux).
There are some limitations under wine, but it works right for the principal functions.
Just some troubles :
The URL bar can't be used (an error message appears, doesn't crash K-Meleon, but a bit ennoying.
There is some problems with buttons (bad colors for some. I haven't found the reason, but it works, and it's what we ask for.
Another problem, but it's that for all the windows program, not only K-Meleon, the path must be corrected to launch K-Meleon from Nautilus, or to open a document link with a Linux program. If you use Ubuntu, I suppose that you don't want to install Windows program (except K-Meleon) to open file links, and you want to use Linux programs instead as me.
I have made an extension, and some macros modifications to be able to open K-Meleon form a local html file, use linux programs when clicking on some file link (pdf, doc, .....) in webpages, to open links with K-Meleon from a linux program (Thunderbird, for example), use the mail possibilities from within K-Meleon (Send page, url, ...), open mailto link.
All of this works.
Other problem, some extensions, like roboform, for example, aren't able to run under linux.
Last problem : I have some crash (I think it's due to wine). I have found a turn around, which allows to crash less often, but crashes continue. I haven't yet found a solution, but I have reported a bug to wine, and I give the more infos to help them to find why.
The crash problem is also the reason why I haven't yet put my linux extension. Because I'm testing some differents things and tools to help to debug, and it also often crashes the wine parameters, and the extension I have made uses some parameters which are saved in wine (registry, ...). So, when wine is crashed, like now when trying winetricks, I must rename .wine folder, and I loose all the parameters.
I must, in fact found a way to preserve (a kind of backup) the parameters to be able to restore it easily. I'm working on it, and when it will be ready, I'll put it online.
Happy to have definitively leave Windows, even there are some troubles with K-Meleon.
Mozilla/5.0 (x11; U; Linux x86_64; fr-FR; rv:38.0) Gecko/20100101 Ubuntu/12.04 K-Meleon/76.0
Mail : alain [dot] aupeix [at] wanadoo [dot] fr
Ubuntu 12.04 - Gramps 3.4.9 - Harbour 3.2.0 - Hwgui 2.20-3 - K-Meleon 76.0 rc