CODE EXAMPLE FOR SHELL

pre-removal script subprocess returned error exit status 127

ls -l /var/lib/dpkg/info | grep -i polar-bookshelf
-rw-r--r-- 1 root root 2324811 Aug 14 19:29 polar-bookshelf.list
-rw-r--r-- 1 root root 2822824 Aug 10 04:28 polar-bookshelf.md5sums
-rwxr-xr-x 1 root root     113 Aug 10 04:28 polar-bookshelf.postinst
-rwxr-xr-x 1 root root      84 Aug 10 04:28 polar-bookshelf.postrm