I could have sworn "lugubration" was a word, but dictionaries I check either draw a blank, or suggest it's a spelling error of "lucubration".
And yet .. it shows up in historical uses:
Queensland Legislative Assembly Hansard (7 SEPTEMBER 1880):
The Press had been unduly fostered by the State, in being allowed to send their lugubrations broadcast throughout the colony without a quid pro quo.
Historical and Descriptive Guide through Shrewsbury (S. F. Williams, 1881):
It can readily be believed, as Dr. Taylor says, that all this lugubration caused “my Lord hymself to change countenance!”
Letter from John Fogg Taylor of Tundemunga, near Adelaide (1840):
[...] & I was resolved not to trouble you with my lugubrations [...]
The two Napoleons and England: Two Pages of History (1858):
The slavery and degredation of France, groaning under the foot of the Corsican usurper, formed the staple of his lugugrations in prose; the dagger that laid low Cæser, graced his verse.
Each of these are possibly related to lucubration ("a learned or pedantic piece of writing"), but each could also be related to lugubrious ("looking or sounding sad and dismal"). Sadly, the only commonality is the paucity of context. My uneducated and unsourced prior sense of the word leans towards the latter sense, so my opinion shouldn't be considered unbiased.
Are there dictionaries or more that can shed light on the old meaning of lugubration?