Jimm Chen's questions

I have a very old PCI card with Nvidia GeForce 4 MX420 chip(dated back in 2002), using it on a Gigabyte GA-970A-DS3 mainboard(AMD 970A chipset).

I tried to install Ubuntu Linux 20.04 on it, but facing a problem using that video card.

If I boot the Ubuntu installer by its default behavior, on some GUI installer phase, the screen is scrambled, shown below:

Later, I find that if I execute the "Install Ubuntu (safe graphics)" menu item, the GUI installer gives normal video output, then I can finish the install phase normally.

So, I think "safe graphics" means using basic VGA driver on my video card. That's OK, totally acceptable.

However, once the formal(installed) Linux boots up, the screen scrambles again, and I think it the installer did NOT relay "safe graphics" trait to the formal Ubuntu instance.

Then, how can I fix that formal Ubuntu instance by telling it to use basic VGA driver all the time?

Thanks in advance.

I'm using Ubuntu 20.04.4 with stock grep version 3.4.

I find something I cannot explain, please help.

[/dev/pts/0(xterm-256color) 2023-04-04 10:28:01 ERR:0]
[chj @Ub20cppdev ~/test]
$ cat input3l.csv 
"C:\Program Files (x86)\Comodo\",223743576,223920128
"C:\Program Files (x86)\Comodo\Dragon\",223743576,223920128
"C:\Program Files (x86)\Comodo\Dragon\dragon_s.dll",127097864,127098880

[/dev/pts/0(xterm-256color) 2023-04-04 10:28:07 ERR:0]
[chj @Ub20cppdev ~/test]
$ cat input3l.csv | egrep '(".+\\"),' 
"C:\Program Files (x86)\Comodo\",223743576,223920128
"C:\Program Files (x86)\Comodo\Dragon\",223743576,223920128

[/dev/pts/0(xterm-256color) 2023-04-04 10:28:19 ERR:0]
[chj @Ub20cppdev ~/test]
$ cat input3l.csv | egrep '(".+\\"),.+' 



[/dev/pts/0(xterm-256color) 2023-04-04 10:28:33 ERR:0]
[chj @Ub20cppdev ~/test]
$ cat input3l.csv | egrep '(".+\\"),.+' > egrep1.txt

[/dev/pts/0(xterm-256color) 2023-04-04 10:28:43 ERR:0]
[chj @Ub20cppdev ~/test]
$ cat egrep1.txt 
"C:\Program Files (x86)\Comodo\",223743576,223920128
"C:\Program Files (x86)\Comodo\Dragon\",223743576,223920128

I have a VM running Ubuntu 22.04 LTS, and I know that Ubuntu 22.04.1 LTS has been released months ago. Then how can I upgrade to 22.04.1 on the fly, keeping all existing software and configs?

I tried sudo do-release-upgrade, but told that There is no development version of an LTS available.

I hope that the answer is suitable to Ubuntu 22.04 running on WSL1 as well, because, there is a weird /usr/bin/gzip problem on WSL1, here: https://github.com/microsoft/WSL/issues/8219

Execute the two commands, that is, adding current user to tcpdump group, then check the result by querying groups. BUT, groups does not report I'm a member of tcpdump why?

Screenshot from Ubuntu 22.04:

At this time, I checked /etc/group file, it has been added.

tcpdump:x:117:chj

In order to see tcpdump listed in groups command, I have to completely log out my desktop session then re-login.

How come it has to be so cumbersome? Am I missing something?

This is a subtle problem I find today. The ps command can show command arguments for a process, but I find the feature crippled.

For a shell command line like this:

gdbserver localhost:5050 testg "hello world" 123

We know that gdbserver's main() will see:

However, ps -ef shows

gdbserver localhost:5050 testg hello world 123

So it looks like argv[3] is hello, which is so misleading.

So may question is clear, is there way to have ps show genuine argv[] values? man ps does not seem to refer to this issue. If it can't, any alternative tools?

Here is a screen shot from Ubuntu Linux 20.04.

On a Ubuntu 18.04 machine, I installed xinetd and inetutils-telnetd to serve TELNET clients, and it works well, accepting both clients from IPv6 clients and IPv4 clients.

One thing I notice is: netstat -ant lists tcp6 port 23 listen entry, but not tcp port 23 listen entry. Why is that?

I'm using Ubuntu 18.04 LTS, and I'm doing something weird on my system.

In crontab -e, I have a line like this:

@reboot sleep 11 && sshpass -p '123456' ssh -D *:7070 socksclient@localhost

so that an ssh client program runs automatically on system startup, acting as a SOCK5 server at port 7070.

But something bad happens. My root partition is slowly running out of space, and I can see this leakage with df, about 100 bytes per second.

After some investigation, lsof | grep deleted reveals that it is ssh or sshpass grabbing [ a file handle to a deleted file-system path(/tmp/#16 in the attached image)] and append content to it continuously, so it is sneakingly hogging my disk space.

BTW: If I run sshpass -p '123456' ssh -D *:7070 socksclient@localhost manually from Linux console, those (delete) entries will not appear.

Those leaked disk space can not be revealed with du, and, they can be freed only by killing the ssh or sshpass process.

So my question is: I want my ssh client to run with system startup, but eliminate disk space leakage. How to achieve that?

I'll be appreciative if someone can tell:

• What's the current size of a deleted file?
• how can I know what content(text) is being appended to the /tmp/#16 file? Maybe some program similar to the Process Monitor on Windows?

As title, I tried command

gnome-session --session=ubuntu

from my PuTTY console, but after some seconds, it fails saying something like:

gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256
gnome-session-is-accelerated: No composite extension.
gnome-session-check-accelerated: Helper exited with code 256
gnome-session[14452]: WARNING: software acceleration check failed: Child process exited with code 1
gnome-session[14452]: CRITICAL: We failed, but the fail whale is dead. Sorry....

What's going wrong?

====== Flashback ======

I have to PCs, A running Windows and Xming, B running Ubuntu 14.04 .

According to tutorial http://www.nth-design.com/2010/05/19/x11-putty-xming/ , I have successfully tell B machines's /usr/bin/firefox to display its window on A's side.

And, according to this post, I guess that gnome-session can be used to display the whole Ubuntu graphical desktop on A's side, but no luck yet. So please help, or, if it is not an easy task, I'd like to know what is the blocking factor.

It has made me like a fool. I'm installing ubuntu-16.04.2-desktop-amd64.iso on a VMware workstation 12 VM, and I'm trapped at selecting time zone.

Screenshots below:

The first sight of the time zone UI is ok.

Click Continue, and something bad happens. Next screen is Keyboard Layout, and *UI right-side is cropped . I click the partially visible button(red arrow marked), in hope that it is Next, but no luck. It just bring me back to time-zone selection UI, and this UI is now also right-side cropped.

The Ubuntu installer uses default screen resolution 800*600. If I could change it to 1024*768, it may have a chance to display correctly. Could some one tell me how to?

BTW: My host machine's screen size is much larger than 800*600(main monitor is 1920*1200).

====== George provides a nice workaround ======

Mouse-dragging the UI window title lets me see the whole scene.