/usr/lib/hugs/packages/base/System/ is in libhugs-base-bundled 98.200609.21-5.3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/hugs/packages/base/System/CPUTime.hs
/usr/lib/hugs/packages/base/System/Cmd.hs
/usr/lib/hugs/packages/base/System/Console/
/usr/lib/hugs/packages/base/System/Console/GetOpt.hs
/usr/lib/hugs/packages/base/System/Directory/
/usr/lib/hugs/packages/base/System/Directory.hs
/usr/lib/hugs/packages/base/System/Directory/Internals.hs
/usr/lib/hugs/packages/base/System/Environment.hs
/usr/lib/hugs/packages/base/System/Exit.hs
/usr/lib/hugs/packages/base/System/IO/
/usr/lib/hugs/packages/base/System/IO.hs
/usr/lib/hugs/packages/base/System/IO/Error.hs
/usr/lib/hugs/packages/base/System/IO/Unsafe.hs
/usr/lib/hugs/packages/base/System/Info.hs
/usr/lib/hugs/packages/base/System/Locale.hs
/usr/lib/hugs/packages/base/System/Mem/
/usr/lib/hugs/packages/base/System/Mem.hs
/usr/lib/hugs/packages/base/System/Mem/StableName.hs
/usr/lib/hugs/packages/base/System/Mem/Weak.hs
/usr/lib/hugs/packages/base/System/Posix/
/usr/lib/hugs/packages/base/System/Posix/Internals.hs
/usr/lib/hugs/packages/base/System/Posix/Internals.so
/usr/lib/hugs/packages/base/System/Posix/Signals.hs
/usr/lib/hugs/packages/base/System/Posix/Signals.so
/usr/lib/hugs/packages/base/System/Posix/Types.hs
/usr/lib/hugs/packages/base/System/Process/
/usr/lib/hugs/packages/base/System/Process/Internals.hs
/usr/lib/hugs/packages/base/System/Process/Internals.so
/usr/lib/hugs/packages/base/System/Random.hs
/usr/lib/hugs/packages/base/System/Time.hs