Can't change my wireless interface channel via iwconfig

Hello community, I'm trying to change my wireless channel 'cause aireplay-ng commands me to do it manually.
What I do:
sudo ifconfig mon0 down
sudo iwconfig mon0 channel 5
Error for wireless request "Set Frequency" (8B04) :
SET failed on device mon0 ; Device or resource busy.
No matter what I do, I get this error message...

The journal shows nothing related to the interface. Not even when I execute the airmon command nor when I try to change the interface channel...
systemctl output:
UNIT LOAD ACTIVE SUB DESCRIPTION
colord.service loaded active running Manage, Install and Generate Color Profiles
cups.service loaded active running CUPS Printing Service
dbus.service loaded active running D-Bus System Message Bus
[email protected] loaded active running Getty on tty1
kdm.service loaded active running K Display Manager
kmod-static-nodes.service loaded active exited Create list of required static device nodes for the cu
mysqld.service loaded active running MariaDB database server
netctl.service loaded active exited (Re)store the netctl profile state
NetworkManager.service loaded active running Network Manager
ntpd.service loaded active running Network Time Service
polkit.service loaded active running Authorization Manager
rtkit-daemon.service loaded active running RealtimeKit Scheduling Policy Service
systemd-backlight@backlight:acpi_video0.service loaded active exited Load/Save Screen Backlight Brightness of backlight:acp
systemd-backlight@backlight:radeon_bl0.service loaded active exited Load/Save Screen Backlight Brightness of backlight:rad
systemd-fsck-root.service loaded active exited File System Check on Root Device
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-modules-load.service loaded active exited Load Kernel Modules
systemd-random-seed.service loaded active exited Load/Save Random Seed
systemd-readahead-collect.service loaded active exited Collect Read-Ahead Data
systemd-remount-fs.service loaded active exited Remount Root and Kernel File Systems
[email protected] loaded active exited Load/Save RF Kill Switch Status of rfkill0
[email protected] loaded active exited Load/Save RF Kill Switch Status of rfkill1
[email protected] loaded active exited Load/Save RF Kill Switch Status of rfkill2
[email protected] loaded active exited Load/Save RF Kill Switch Status of rfkill3
[email protected] loaded active exited Load/Save RF Kill Switch Status of rfkill4
systemd-sysctl.service loaded active exited Apply Kernel Variables
systemd-tmpfiles-setup-dev.service loaded active exited Create Static Device Nodes in /dev
systemd-tmpfiles-setup.service loaded active exited Create Volatile Files and Directories
systemd-udev-trigger.service loaded active exited udev Coldplug all Devices
systemd-udevd.service loaded active running udev Kernel Device Manager
systemd-update-utmp.service loaded active exited Update UTMP about System Boot/Shutdown
systemd-user-sessions.service loaded active exited Permit User Sessions
systemd-vconsole-setup.service loaded active exited Setup Virtual Console
udisks2.service loaded active running Disk Manager
upower.service loaded active running Daemon for power management
[email protected] loaded active running User Manager for UID 1000
wpa_supplicant.service loaded active running WPA supplicant

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