family@A-Inspiron-3521:~$ ls /lib/modules/`uname -r`/kernel/net/wireless/wl*
/lib/modules/3.13.0-39-generic/kernel/net/wireless/wl.ko
family@A-Inspiron-3521:/lib/modules/3.13.0-39-generic$ depmod
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.dep.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.dep.bin.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.alias.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.alias.bin.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.softdep.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.symbols.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.symbols.bin.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.builtin.bin.tmp, 1101, 644): Permission denied
depmod: ERROR: openat(/lib/modules/3.13.0-39-generic, modules.devname.tmp, 1101, 644): Permission denied