unar binary package in Ubuntu Bionic i386

 The Unarchiver is an archive unpacker program with support for the popular
 zip, RAR, 7z, tar, gzip, bzip2, LZMA, XZ, CAB, MSI, NSIS, EXE, ISO, BIN, and
 split file formats, as well as the old Stuffit, Stuffit X, DiskDouble, Compact
 Pro, Packit, cpio, compress (.Z), ARJ, ARC, PAK, ACE, ZOO, LZH, ADF, DMS, LZX,
 PowerPacker, LBR, Squeeze, Crunch, and other old formats.
 .
 This package contains the lsar tool which lists the contents of archives and
 the unar tool which extracts those contents.

Source package