mjhjmtu

I've recently installed xubuntu 17.10. I noticed some error messages while booting. Here's the my dmesg output(only errors and their previous lines):

... 
[ 13.717201] usb 5-3: USB disconnect, device number 2 
[ 15.164286] Bluetooth: hci0 command 0xfc20 tx timeout 
... 
[ 20.756846] Bluetooth: BNEP socket layer initialized 
[ 23.260344] Bluetooth: hci0: download fw command failed (-110) 

The line with [ 15.164286] and [ 23.260344] are shown in red(errors) on my console. I doubt this is what slowing down the boot process(approx. 5 secs). How can I solve this issue?

Edit: My lsmod output:

Module Size Used by
rndis_host 16384 0
cdc_ether 16384 1 rndis_host
usbnet 45056 2 rndis_host,cdc_ether
bnep 20480 2
arc4 16384 2
rtl8723ae 94208 0
btcoexist 131072 1 rtl8723ae
rtl8723_common 24576 1 rtl8723ae
rtl_pci 32768 1 rtl8723ae
snd_hda_codec_realtek 98304 1
snd_hda_codec_hdmi 49152 1
snd_hda_codec_generic 73728 1 snd_hda_codec_realtek
rtlwifi 77824 4 rtl_pci,btcoexist,rtl8723_common,rtl8723ae
snd_hda_intel 40960 4
snd_hda_codec 126976 4 snd_hda_intel,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
snd_hda_core 81920 5 snd_hda_intel,snd_hda_codec,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
kvm_amd 2179072 0
kvm 589824 1 kvm_amd
irqbypass 16384 1 kvm
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 98304 4 snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi
mac80211 782336 2 rtl_pci,rtlwifi
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
cdc_acm 32768 0
btusb 45056 0
btrtl 16384 1 btusb
btbcm 16384 1 btusb
btintel 16384 1 btusb
joydev 20480 0
bluetooth 544768 11 btrtl,btintel,bnep,btbcm,btusb
sparse_keymap 16384 0
input_leds 16384 0
serio_raw 16384 0
input_polldev 16384 0
ecdh_generic 24576 1 bluetooth
i2c_piix4 24576 0
snd_rawmidi 32768 1 snd_seq_midi
k10temp 16384 0
rtsx_pci_ms 20480 0
memstick 16384 1 rtsx_pci_ms
snd_seq 65536 2 snd_seq_midi_event,snd_seq_midi
cfg80211 614400 2 mac80211,rtlwifi
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 32768 2 snd_seq,snd_pcm
shpchp 36864 0
snd 81920 19 snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_timer,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_seq_device,snd_hda_codec_realtek,snd_pcm
soundcore 16384 1 snd
mac_hid 16384 0
parport_pc 32768 0
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,parport_pc,ppdev
ip_tables 24576 0
x_tables 40960 1 ip_tables
autofs4 40960 2
hid_generic 16384 0
usbhid 49152 0
hid 118784 2 hid_generic,usbhid
rtsx_pci_sdmmc 24576 0
amdkfd 188416 1
amd_iommu_v2 20480 1 amdkfd
radeon 1478656 3
psmouse 147456 0
i2c_algo_bit 16384 1 radeon
ttm 94208 1 radeon
drm_kms_helper 167936 1 radeon
syscopyarea 16384 1 drm_kms_helper
r8169 86016 0
sysfillrect 16384 1 drm_kms_helper
mii 16384 2 r8169,usbnet
sdhci_pci 28672 0
sysimgblt 16384 1 drm_kms_helper
fb_sys_fops 16384 1 drm_kms_helper
sdhci 45056 1 sdhci_pci
ahci 36864 3
libahci 32768 1 ahci
drm 360448 6 radeon,ttm,drm_kms_helper
rtsx_pci 57344 2 rtsx_pci_sdmmc,rtsx_pci_ms
wmi 24576 0
video 40960 0

You can try disabling the bluetooth service (sudo systemctl disable bluetooth) to see if it helps. Another step you could take is figuring out which module is loaded for bluetooth support and blacklist that module, which should prevent the error.

Add a line blacklist bluetooth to /etc/modprobe.d/blacklist.conf , if the module doesn't depend on others. If it does depend on others, add a line install bluetooth /bin/false instead. Check this for more info.