Blankman's questions

Running sudo apt-get update on ubuntu 20.04.2 LTS is giving me this error:

Hit:1 https://download.docker.com/linux/ubuntu focal InRelease
Ign:2 http://binaries.erlang-solutions.com/debian focal InRelease
Hit:3 http://binaries.erlang-solutions.com/debian focal Release
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:6 https://packages.microsoft.com/ubuntu/21.04/prod hirsute InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:8 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Err:9 https://dl.bintray.com/sbt/debian  InRelease
  403  Forbidden [IP: 35.155.141.94 443]
Hit:10 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Reading package lists... Done
E: Failed to fetch https://dl.bintray.com/sbt/debian/InRelease  403  Forbidden [IP: 35.155.141.94 443]
E: The repository 'https://dl.bintray.com/sbt/debian  InRelease' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

How can I run an update without getting this error? Is it a matter of somehow removing this repository to get updates from?

The last thing I did was try and install the dotnet sdk on my system:

wget https://packages.microsoft.com/config/ubuntu/16.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
rm packages-microsoft-prod.deb

But I haven't run an update in a while so maybe it could have been something else...

Update

I am unable to update my server now b/c of this error. Is there a way to just skip this repository somehow? Does this package get read by everyone or is it just mine instance b/c I was trying to install a package and now it has added this repo to my list of resources to check for updates?

Update 2

ls -alFh /etc/apt/sources.list.d

drwxr-xr-x 7 root root 4.0K Nov 22 16:08 ../
-rw-r--r-- 1 root root  183 Dec  3 12:25 erlang-solutions.list
-rw-r--r-- 1 root root  183 Dec  3 12:25 erlang-solutions.list.save
-rw-r--r-- 1 root root   91 Dec  3 12:25 microsoft-prod.list
-rw-r--r-- 1 root root   91 Dec  3 12:25 microsoft-prod.list.save
-rw-r--r-- 1 root root   40 Dec  3 12:25 sbt.list
-rw-r--r-- 1 root root   40 Dec  3 12:25 sbt.list.save

cat /etc/apt/sources.list

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu/ focal main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ focal universe
# deb-src http://archive.ubuntu.com/ubuntu/ focal universe
deb http://archive.ubuntu.com/ubuntu/ focal-updates universe
# deb-src http://archive.ubuntu.com/ubuntu/ focal-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ focal multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-updates multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ focal-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu focal partner
# deb-src http://archive.canonical.com/ubuntu focal partner

deb http://security.ubuntu.com/ubuntu/ focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu/ focal-security main restricted
deb http://security.ubuntu.com/ubuntu/ focal-security universe
# deb-src http://security.ubuntu.com/ubuntu/ focal-security universe
deb http://security.ubuntu.com/ubuntu/ focal-security multiverse
# deb-src http://security.ubuntu.com/ubuntu/ focal-security multiverse
deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable
# deb-src [arch=amd64] https://download.docker.com/linux/ubuntu focal stable

I installed Ubuntu 20.x recently, but if I am keep this as my main operating system I would like to encrypt my hard drive contents in case of theft etc.

Is it possible to perform encryption at this point or this is something I have to do during the installation process?

So I am running Ubuntu 18.04 as my desktop machine on my new laptop. I am using this primarily for development.

Some services I want to use are using older versions like redis, go progrmaming language versions etc. I end up googling around and this usually requires me to manually install or add repositories etc. if I use apt.

What are the ramifications if I use homebrew?

I didn't realize it works on linux. Will this cause potential conflicts with apt related packages?

I just bought a thinkpad x1 carbon extreme (i7 16GB, 512GB) and I installed Ubuntu 18.04.3 LTS using a USB.

So the installation went smooth, and once I hit the login screen this is what happened

1. first time I entered my login and password, hit enter and the login screen goes away and its a blank screen with just the background and its frozen

   2. second time around after a hard reboot I enter my login and password, this time use the trackpad to click the login button and it froze

   3. third time I selected ubuntu with advanced options and did recovery mode and I was able to login and even install some packages etc. Once I rebooted and tried normal boot it froze again.

What could the issue be here?

Update When I boot ubuntu from my USB drive everything worked fine. I was able to connect my wifi, download some packages and I did not notice any issues at all.

I have a deploy user that has sudo privledges.

I can't sudo cd into the directory, but I can list it like:

sudo ls /root

How can I cd into the folder, or is that not possible?

I changed the password for a user, but if someone still has the SSH key on their laptop the user can still login right?

The password is only used if you don't have a SSH key right?

I'm trying to test if a service is up and running using nc.

echo ruok | nc 127.0.0.1 5111

But I get this response:

This is nc from the netcat-openbsd package. An alternative nc is available
in the netcat-traditional package.
usage: nc [-46DdhklnrStUuvzC] [-i interval] [-P proxy_username] [-p source_port]
      [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_protocol]
      [-x proxy_address[:port]] [hostname] [port[s]]

I'm not sure how to use this 'alternative nc', can someone please explain this to me?

I tried:

echo ruok | nc -s 127.0.0.1 -p 5111  

but I got the same message.

I was updating my .bash_profile, and unfortunetly I made a few updates and now I am getting:

env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
env: bash: No such file or directory
-bash: tar: command not found
-bash: grep: command not found
-bash: cat: command not found
-bash: find: command not found
-bash: dirname: command not found
-bash: /preexec.sh.lib: No such file or directory
-bash: preexec_install: command not found
-bash: sed: command not found
-bash: git: command not found

My bash_profile actually pulls in other .sh files (sources them) so I am not exactly sure which modification may have caused this.

Now if I even try and to a list of files, I get:

>ls
-bash: ls: command not found
-bash: sed: command not found
-bash: git: command not found

Any tips on how to trace the source of the error, and how to be able to use the terminal for basic things like listing files etc?

I have ubuntu 10.10 installed, and when I hit my IP I see:

It works!

This is the default web page for this server.

The web server software is running but no content has been added, yet.

Where should I look to see where this is being served from?

The strange thing is, I just installed nginx and setup a static page that is served on port 80 also (should be conflicting with the default apache that is serving the 'it works page'), when I restart nginx I don't get bind error sayign port 80 is already taken.

I dont' use apache, and don't want it but the default install seems to have it. I ahve no idea where it is, I don't see it in /opt or etc/apache .

thanks!

On a server when I login as root I see .bashrc (Ubuntu 10.10).

On my Mac I have a .bash_profile

Does Ubuntu always have only a .bashrc file and not .bash_profile? (I'm just confused, so asking, I realize they are different o/s's but maybe there is a relationship somehow?)

On my server, I want to create an alias, should I put it in .bashrc?

What if I want this alias to be applied so all users can use it?

I'm looking at this debian package

Before installing it, I'm curious about how much information I can get just by analyzing the debian package.

I would love to know exactly what is going to be installed and where.

is this possible?

I want to see the contents of a debian package, especially if the package is properly cleaning up whatever it installs.

I want to also see how it goes about installing the software, what directories it creates, symbolic links etc.

Is it possible to see what version of jetty will be installed on the various versions of Ubuntu?

Is it online somewhere?

Also, is it possible to see the package so I can tweak it if required?

I am at the path:

/myuser/downloads/

And I create a sub folder:

/myuser/downloads/new

Now I want to move all files and folders/sub-folders in the downloads folder to the sub-folder.

how can I do this?

I tried:

mv -R *.* new/

But move doesn't take the -R switch it seems.

Trying to locate a file, how can I search the entire hard drive for a file?

I want to search for all files with the .sql extension in folders and sub-folders (recursive).

How can I do this?

Other than Ctrl + A and Ctrl + E to jump to the front or end of the command-line, what other things can you do?

Is it possible to delete the entire line? Or to the next or pervious word in the line?

Other than viewing the history, is there a way to filter my history?

Say I want to search for a command that started with "ssh"?

When I install this:

sudo apt-get install -y sun-java6-bin sun-java6-jdk sun-java6-jre sun-java6-plugin

I am still forced to select OK and YES during the install.

The -y switch doesn't work for this.

Is there a way to do this automatically?

So I was playing around with a ubuntu 11 VPS, and I installed tomcat using apt-get, and after some time I messed something up, and instead of figuring out the issue I thought I could just remove the package and start over.

sudo apt-get remove tomcat6

I noticed when I removed the package, the folders that tomcat used were still around, so I deleted them:

/etc/tomcat6
/var/lib/tomcat6/
/usr/share/tomcat6

When I tried to install the package again, there were some errors as it was trying to look for files in I believe /usr/share/tomcat6 (I don't recall now).

Did I miss a step or something, shouldn't have this theoretically worked?