syslog contains a whole lot of ^@

[Ian A Taylor]

Sir/Madam

I have Ubuntu box that runs Ubuntu 14:04

lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.4 LTS
Release:    14.04
Codename:    trusty

uname -a
Linux nabucodonosor 3.13.0-86-generic #130-Ubuntu SMP Mon Apr 18 
18:27:15 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

However it is only booting up correct on the odd occasion.

When it fails it does seem pingable and nmap says port 22 is open but it 
will not allow ssh


ssh -v
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to nabucodonosor [138.251.106.222] port 22.
debug1: connect to address 138.251.106.222 port 22: No route to host
ssh: connect to host nabucodonosor port 22: No route to host

In /var/log/syslog there are a whole lot of blue ^@
They seem only to appear when system fails to allow ssh

The graphic login screen also fails to appear

Does anyone know what these blue ^@ mean ?

lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to 
PCI bridge (external gfx0 port B) (rev 02)
00:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to 
PCI bridge (PCI express gpp port D)
00:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890 PCI to 
PCI bridge (PCI express gpp port H)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 SATA Controller [IDE mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 SMBus 
Controller (rev 42)
00:14.1 IDE interface: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 IDE Controller (rev 40)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 
Azalia (Intel HDA) (rev 40)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 PCI to 
PCI Bridge (rev 40)
00:14.5 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
00:15.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] 
SB700/SB800/SB900 PCI to PCI bridge (PCIE port 0)
00:16.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:16.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h 
Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h 
Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h 
Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h 
Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h 
Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h 
Processor Function 5
01:00.0 USB controller: VIA Technologies, Inc. VL805 USB 3.0 Host 
Controller (rev 01)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
04:00.0 VGA compatible controller: NVIDIA Corporation GT218 [NVS 300] 
(rev a2)
04:00.1 Audio device: NVIDIA Corporation High Definition Audio 
Controller (rev a1)




-- 

Thanking you.

Yours sincerely



Ian Taylor
University of St.Andrews,
School of Physics & Astronomy,
North Haugh,
St.Andrews,
Fife  KY16 9SS,
Scotland.

e-Mail :- iat at st-and.ac.uk
Tel    :- (0)1334-463141
Fax    :- (0)1334-463104

The University of St Andrews
is a charity registered in
Scotland : No SC013532.

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