"error while loading shared libraries" "No such file or directory"
 

I have for the first time installed a Ubuntu system. I downloaded the image off the Ubuntu site and installed it OK.

Everything seemed to work OK until I tried the "man" command. then I get
For a start, the file exists, and it seems to have the same sort of file protections as my other linux system, and it's in the same sort of place.

Reading up this people suggest LD_LIBRARY_PATH, but that seems OK too

I stuck /usr/lib/man-db on the end in the vain hope it would work, but it didn't.

Has anyone got any ideas what is going on ? Pretty much everything else seems to work.

Is this a 32-bit or a 64-bit system?

What do file $(which man) and ldd $(which man) have to say about the man executable?

Perhaps one run of ldconfig will fix it.

Tried running ldconfig and setting the cache, but it didn't help.

mike@ubuntu:~$ file $(which man)
/usr/bin/man: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=9d1d6afa5c4cd04bcba60554a3ece9c7e9c4c03d, for GNU/Linux 3.7.0, stripped
mike@ubuntu:~$ ldd $(which man)
linux-vdso.so.1 (0x0000ffffa0eff000)
libmandb-2.10.2.so => /usr/lib/man-db/libmandb-2.10.2.so (0x0000ffffa0d70000)
libman-2.10.2.so => /usr/lib/man-db/libman-2.10.2.so (0x0000ffffa0d30000)
libz.so.1 => /lib/aarch64-linux-gnu/libz.so.1 (0x0000ffffa0d00000)
libpipeline.so.1 => /lib/aarch64-linux-gnu/libpipeline.so.1 (0x0000ffffa0ce0000)
libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffffa0b30000)
/lib/ld-linux-aarch64.so.1 (0x0000ffffa0ec6000)
libgdbm.so.6 => /lib/aarch64-linux-gnu/libgdbm.so.6 (0x0000ffffa0b10000)
libseccomp.so.2 => /lib/aarch64-linux-gnu/libseccomp.so.2 (0x0000ffffa0ae0000)
mike@ubuntu:~$ ls -al /bin/man
-rwxr-xr-x 1 root root 116144 Mar 17 2022 /bin/man

and what about: file /usr/lib/man-db/libmandb-2.10.2.so

mike@ubuntu:~$ ls -al /usr/lib/man-db/libmandb-2.10.2.so
-rwxr-xr-x 1 root root 22448 Mar 17 2022 /usr/lib/man-db/libmandb-2.10.2.so
mike@ubuntu:~$

Not sure if it needs to be marked executable or not. I suspect not.

But ldd finds it so why is it saying it doesn't exist.

It has to be something obvious, but I cant see it, and other the "man" cammand everything seems to be working OK.

file, not ls.

mike@ubuntu:~$ file /usr/lib/man-db/libmandb-2.10.2.so
/usr/lib/man-db/libmandb-2.10.2.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, BuildID[sha1]=f3c95f5ff40f6101b1c4840af73c7621edf01c76, stripped

ok, it is quite strange. In such cases I would suggest you to run: and grep libmandb in that /tmp/strace.log

Oh, err. It's coming up permission denied. So it knows it is there. Now just got to work out why it's permission denied.

mike@ubuntu:~$ cat /tmp/strace.log | grep libmandb
openat(AT_FDCWD, "/usr/lib/tls/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/tls/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
openat(AT_FDCWD, "/lib/tls/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/tls/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
openat(AT_FDCWD, "/usr/local/lib/tls/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/local/lib/tls/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/local/lib/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/local/lib/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
openat(AT_FDCWD, "/usr/lib/man-db/tls/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/man-db/tls/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/man-db/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/man-db/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
openat(AT_FDCWD, "/usr/lib/man-db/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
openat(AT_FDCWD, "/lib/aarch64-linux-gnu/tls/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/aarch64-linux-gnu/tls/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/aarch64-linux-gnu/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/aarch64-linux-gnu/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
openat(AT_FDCWD, "/usr/lib/aarch64-linux-gnu/tls/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/aarch64-linux-gnu/tls/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/aarch64-linux-gnu/aarch64/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/aarch64-linux-gnu/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
openat(AT_FDCWD, "/usr/lib/libmandb-2.10.2.so", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
writev(2, [{iov_base="man", iov_len=3}, {iov_base=": ", iov_len=2}, {iov_base="error while loading shared libra"..., iov_len=36}, {iov_base=": ", iov_len=2}, {iov_base="libmandb-2.10.2.so", iov_len=18}, {iov_base=": ", iov_len=2}, {iov_base="cannot open shared object file", iov_len=30}, {iov_base=": ", iov_len=2}, {iov_base="Permission denied", iov_len=17}, {iov_base="\n", iov_len=1}], 10) = 113
mike@ubuntu:~$

"sudo man ping" works. So it really is a permissions thing.

So apart from Owner, Group, Other. What other permissions are there on Ubuntu ? Does it use ACL and selinux ? I tried getfacl and it's not installed, so I guess ACLs are not used on this Ubuntu system.

probably you need to set execute permission on that lib

No. Makes no difference.

This may sound crazy, but does this system have man group?

No, something is not ok here:
These are located in /lib and /usr/lib. And probably they really not accessible, but available. You need to check the permission on those files, not inside /usr/lib/man-db.

It does. I added my user to the man group. Logged out and back in. Made no difference.