This has been bugging me for ages, it tends to come and go. I see it most of the time just after the system has crashed or shutdown down uncleanly. swapon fails, claiming that the LovVol01 is busy. What's freaky, is that boot then continues, and after logging in, swapon -s shows that the swap was activated. (ignore the lines about sdc1 in the screengrab, thats my unplugged mp3 player).
Created attachment 132276 [details] screenshot
*** This bug has been marked as a duplicate of 196179 ***