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Messages - Mad Penguin

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1
Linux Support / Re: Rsync
« on: September 02, 2021, 01:48:17 pm »
Hi,
Just a couple of comments on pattern matching, as Keith pointed out, although Windows pattern matching "looks" like Linux/bash pattern matching, there are some subtle differences. If you try the following;
Code: [Select]
echo *
echo .*
echo *.*
  • You will see that "*" matches all files (that do NOT begin with '.')
  • ".*" will match all files that DO begin with "."
  • And "*.*" will match all files that contain a "." (but do not begin with a dot)
:)

2
Linux Support / Re: Keyboard and mouse problems
« on: August 03, 2021, 10:10:39 am »
Ok, for what it's worth;

https://linuxforums.org.uk/index.php?topic=13782.msg111182#msg111182

I'm still using this unaltered .. probably average of 8h/day but runs 24x7 .. had exactly zero problems with it .. using KUbuntu  :)

3
Ironically, the "most-used" feature of my Xerox is scan to email .. insert document, enter email address on printer console, press scan. I'd not even considered the scanning feature at the outset, but it's turned out to be incredibly useful. Seems to be a feature of many of the new multi-function printers, I maybe I'm getting old .. keeping up is becoming hard ..  :(

4
Hi Keith .. so I'm not sure where your £/page comes from, but historically I avoid figures coming from the manufacturer when it comes to ink or printing costs. I tend to use "printerland.co.uk" as they seem to sell almost everything and don't seem to lean in any particular direction. If you take a look at their printer specs, they include a cost/page for every printer.

https://www.printerland.co.uk/product/hp-officejet-8015/147297

I don't know how accurate these numbers are, but after having worked with a bunch of different inkjets, they don't seem unrealistic. As a rule of thumb, I tend to find lasers 1/2 to 1/3 the cost of inkjets (per page) .. in practice with cartridge failures etc, my personal experience is that over the short term or for very infrequent use, inkjets can be much more cost effective. If on the other hand you're keeping the printer for a while or want to do lots of printing, over time it tends to even out ... that said mileage will depending on the printer .. :)

5
Linux Support / Re: Can't get Smartmontools
« on: July 31, 2021, 12:03:00 pm »
Smartmontools includes a background daemon that will [optionally] periodically monitor your storage devices and attempt to report any problems it finds .. via email (!) .. so just be aware, if you opt not to install  some sort of basic email facility on your machine, you may not get notifications if impending doom should one of you drives start to fail ..  ;)

6
Linux Support / Re: Keyboard and mouse problems
« on: July 26, 2021, 03:32:43 pm »
Sure, if all your fans are running, heat shouldn't be an issue .. but chips typically don't run from cold for more than a minute or two without a working heat-sink / fan, so any sort of failure in that department can easily be terminal ..  :)


7
Hardware Compatibility / Re: HP Envy 5030 'not printing' problem.
« on: July 25, 2021, 02:44:09 pm »
Cool, nice to see working solutions ..  :)
Some of the multi-function all-in-one devices work pretty well, but there is a tendency to need drivers or additional drivers which doesn't always make the printing experience totally seamless. If anyone is on the lookout for a seamless solution, this might be worth a read;
https://linux.uk/printing-from-linux/

8
Linux Support / Re: Keyboard and mouse problems
« on: July 25, 2021, 01:02:51 pm »
Hi, could be hardware, but it's always worth checking /var/log/syslog and /var/log/kern.log around the time the machine crashed to see if there is anything system or hardware related mentioned in any context. That aside, memory is always a good thing to check, but in this weather, also temperature. Internal fans are always subject to failure which can result in overheating.

If you don't have it already installed, "lm-sensors" is a good package to have, once installed "sensors-detect" will set things up. Then you should get something like this, which should give you an idea of whether your machine is running hot;
Code: [Select]
$ sensors 
k10temp-pci-00c3
Adapter: PCI adapter
Tdie:         +33.5°C  (high = +70.0°C)
Tctl:         +33.5°C 
I've just noticed that Ubuntu isn't installing "smartmontools" by default, this is also a good one to have. Unlikely to cause this issue but it's always worth keeping an eye on your storage, for example;
Code: [Select]
$ smartctl -A /dev/sdc 
smartctl 7.1 2019-12-30 r5022 [x86_64-linux-5.4.0-80-generic] (local build)
Copyright (C) 2002-19, Bruce Allen, Christian Franke, [url=http://www.smartmontools.org]www.smartmontools.org[/url]
 
=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always       -       1
  3 Spin_Up_Time            0x0027   178   170   021    Pre-fail  Always       -       4058
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       172
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   004   004   000    Old_age   Always       -       70656
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       172
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       85
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       86
194 Temperature_Celsius     0x0022   106   098   000    Old_age   Always       -       41
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   100   253   000    Old_age   Offline      -       0
Again, in this weather, worth keeping an eye on #194, different drives have different temperature tolerances and best-case for running 'hot' is that it's likely to decrease you drive's life expectancy.

I still have memories from the early 90's of responding to a technical support request listing an apparent CPU lockup which wouldn't correct itself with a power cycle. On opening up the machine I found that the CPU fan had failed (well, my best guess) which had caused the CPU to get so hot the entire plastic CPU assembly (and fan) had melted and become a puddle of plastic covering the middle of the motherboard. Heat kills!   :(

9
Hi Webret, it would help if you were able to detail what it is you are trying to accomplish with regards to "seeing packages". Netstat and Wireshark are great tools in context, but are more for real-time traffic analysis .. you might also like to take a look at "ntop", which is orientated more towards traffic analysis "after the fact", but does provide some detail with regards to traffic flow per application.

Sample screenshot here;
https://i0.wp.com/www.ntop.org/wp-content/uploads/2020/03/Host_Application_Protocols.png?ssl=1

Website is here;
https://www.ntop.org/

I know it looks a bit professional, but as far as I'm aware it's available under GPL3 license. (i.e. Open Source)
(apt install ntopng on Ubuntu)

10
Linux Support / Re: Rsync
« on: July 15, 2021, 09:48:36 am »
You could try adding "--progress" to see how far it gets, however it would seem possible that your memory stick / flash drive is worn (or full). Have you tried backing it up to an alternate location? Flash storage devices historically employ lots of different mechanisms to handle the limited write cycles feature of flash, i.e. that you can only write to each location up to (n) times" where (n) can be as low as 1000. Ultimately, despite lots of space showing as free on the device, it can effectively have run out of available writable blocks .. and drivers can be pretty "bad" at handling this edge-case - infinite retries are not unknown.

11
Linux Support / Re: Frequent crashing of 18.04
« on: July 15, 2021, 09:41:49 am »
Ok, so whereas it's entirely possible that your installation software is at issue, it's not generally the cause of issues like this. The two most likely options are;
  • Driver incompatibility
  • Hardware fault (specifically, memory, but possibly disk)
The former historically being the "most" likely. If you look in "/var/log" following a crash, specifically at files "syslog" and "kern.log", if you can identify in the log files "when" the crash happened and look at log entries leading up to this point, it may give some indication of what caused the problem. (whether it be memory or a driver) Unless you are doing something particularly exotic, video drivers are often good candidates for mouse / screen freezes.

As Emegra pointed out, the other thing to try is a memory test .. when you first power on the machine the BIOS will have the facility to check it's memory before booting, sometimes this is a keypress, sometimes you first need to enter the BIOS to enable the feature. If you run this before booting (it can take a few minutes) it should prove / eliminate memory as a potential issue.

If it turns out you have a video issue (he says looking in the general direction of NVIDIA  ??? )  the first port of call would be to try different drivers. Some drivers have propriety AND open source variants and the relative features / stability vary. In the past I've found that some propriety drivers (NVIDIA in particular) have different versions and it can be critical to the stability of your machine you get the right version of the driver for your specific video card. If in doubt, revert to the open source version of the drivers to first establish this is the issue.

As a rule of thumb, if you can install a package, it was probably Ok at source, so if you didn't get any errors during installation, any software corruption is likely to be a storage issue within your machine. If the drive (HDD or SSD) is > 3 years old, personally I'd just swap it out before going any further, but at the very least it's worth running a non-destructive disk check on the entire disk just to make sure it reads reliably. Many people will tell you "I've never had a hard disk fail!", but just looking at the shelf behind be, I have ~ 40 units (>30Tb) of failed HDD's, and half a dozen smaller SSD's ... average lifespan on modern disks (for me) seems to be 3-5 years.

One more thought, how much memory / swap do you have? Some desktop options (I won't say "Gnome" but ..) eat memory and can get upset if you run out. Minimum practical memory is probably 4G + 2G Swap, but I'd recommend "at least" 8G. If you have less than 8Gb, you might want to consider XUbuntu. (I have seen lack of memory cause lockups, despite that not being expected behaviour)

12
General Discussion / Re: Changes to the Forum pages
« on: June 19, 2021, 02:31:58 pm »
Just as a general comment - I tend to use the default font size supplied with the browser then use "CTRL+mouse wheel" to change the zoom level for specific sites if the size is off. There "can" be adverse formatting effects on "some" sites if you choose to change the default font size in the browser ...

13
General Discussion / Re: Suggestion for this forum view set up
« on: June 18, 2021, 01:51:51 am »
Ahh, Ok, I think I see what you mean. The template is set to a 'fixed' width of 1200px, with 1280 being a sort of minimum desktop standard for the last 10-15 years or so. However, that doesn't really allow for phones etc.

There's a limit to what I can do without re-writing Nolt's template or picking another one, however I've had a stab at changing from "fixed" to "maximum", so the entry box should now scale to the window size, or at least down to around 700px. If your Window / display is less than 700px wide then it's not really going to work with this template for all sorts of reasons. I've also upped the default "height", although note that you can always increase the height of the entry box by dragging the sizer handle at the bottom of the window.

Let me know if that helps.

Quote
which does not fit onto any screen!

Erm, well, it fits on "all" my screens and this is the first query I've seen in 10 years, so I'm not sure "all" is entirely accurate ..  ;)  .. if that doesn't fix it, can you could post a screenshot somewhere so I can see exactly what the problem is?

14
General Discussion / Re: Suggestion for this forum view set up
« on: June 17, 2021, 02:15:01 am »
Hi, I've tweaked some of various font sizes .. how does it look now?

15
Linux Support / Re: ip neigh and arp - incorrect MAC address
« on: June 06, 2021, 11:31:52 am »
No problem, this is great! .. not only does it mean you'll spot this immediately next time, it means you'll be able to help the next person with the same problem!   ;-)
I just feel grateful the days of BNC and Token Ring networks are behind us ... :)

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