I am not able to install parallel tools to ParrotOS 5.1.2 due to package problem with libelf-dev here its detail: > The following packages have unmet dependencies: libelf-dev : Depends: libelf1 (= 0.183-1) but 0.187-1~bpo11+1 is to be installed E: Unable to correct problems, you have held broken packages.
https://community.parrotsec.org/t/unable-to-install-libelf-dev-to-parrotos-5-1-ara/26020/3 try this one