unusual Update Manager update offering

[Default User]

Update Manager just popped up with the latest list of new updates.  The
list shows 8 total updates.  But for one of these, 

libtotem-plparser10

the "check" button in front of it was unchecked.  I have never seen this
happen before.  I did, 

sudo find / libtotem-plparse* 

which found no such file on my system.  But Totem 2.22.1 does appear to
be installed on my system.  So, 

1) Why is this update not "checked", and 

2) Should I just do the other updates as usual and ignore this one, or
check the update to do it also, or do something else?