GParted — расширить основной раздел Debian в свободное пространство

strace может представлять интерес.

# strace -fe open useradd bob
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libaudit.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libacl.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libcap-ng.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libattr.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/proc/filesystems", O_RDONLY)     = 3
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 4
open("/proc/sys/kernel/ngroups_max", O_RDONLY) = 4
open("/etc/default/useradd", O_RDONLY)  = 4
open("/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 5
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 5
open("/lib64/libnss_files.so.2", O_RDONLY|O_CLOEXEC) = 5
open("/etc/group", O_RDONLY|O_CLOEXEC)  = 5
open("/etc/login.defs", O_RDONLY)       = 4
open("/etc/passwd", O_RDONLY|O_CLOEXEC) = 4
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 4
open("/lib64/tls/x86_64/libnss_sss.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[etc]