Shalom, Will the Mashiach return in a shemitah or a Jubilee year?
ANSWER: via Dov bar Leib
The Yovel (jubilee) year is 5776 not 5777. 5775 is a Shmittah (Sabbatical) year. Yovel years must be Motzei Shmittah (the year after Shmittah).
5776 begins the Malkhut she beMalkhut Yovel cycle since Ezra HaSofer. This makes 5776 a potential Yovel year since there are no real Yovel years since the destruction of the 2nd Temple. So we are ending the yesod that is in malkhut year of the yesod that is in malkhut Yovel cycle since Ezra HaSofer.
During the 2nd Temple, the Yovel cycle was 50 years. But after the churban bayit sheini, the Yovel cycles were 49 year cycles.
The Shmittah year begins this Rosh Hashana, Jewish year 5775 or secular year 2014.