/usr/share/gocode/ is in golang-github-nebulouslabs-merkletree-dev 0.0~git20170901.0.8482d02-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/
/usr/share/gocode/src/github.com/
/usr/share/gocode/src/github.com/NebulousLabs/
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/cachedtree.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/cachedtree_test.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/debugoff.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/debugon.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/fuzz.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/merkletree.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/readers.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/readers_test.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/tree.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/tree_test.go
/usr/share/gocode/src/github.com/NebulousLabs/merkletree/verify.go