I'm new to Ubuntu and having some trouble after installing Atom. First time I failed and removed it. Second time I succeeded and got it running.   But now when I run sudo apt-get update I get the following error:  W: GPG error: https://packagecloud.io/AtomEditor/atom/any any InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4C6E74D6C0A35108  W: The repository 'https://packagecloud.io/AtomEditor/atom/any any InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details.   How can I fix this problem?
3882
I added some extra repositories with the Software Sources program. But when I reload the package database, I get an error like the following:     W: GPG error:  trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8BAF9A6F   I know I can fix it using apt-key in a terminal, according to the official Ubuntu documentation. But I would have liked to do it graphically. Is there a way to do this without using a terminal?
111384
I publish .  It was signed with a 4096-bit GPG key, and has been merrily in use from Debian 7 and Debian 8 systems for some time.  Recently, one of my users reported that Debian 9 was having problems with it.  Specifically, apt-get update was yielding: Reading package lists... Done    W: GPG error: . stable InRelease: The following signatures were invalid: A71733F3CEBD655CB25A0DDCE1E3A497555CE68F    W: The repository '. stable InRelease' is not signed.  Note that unlike the people at "" and "" I am not using aptly.  So clearly I am not suffering from an aptly bug of any kind.  (-:  So what is the problem?
56594
I have tried to find some PPA's for Ubuntu 14.04 but didn't find any. So I tried to install the package for previous releases, with no luck and a lot of dependencies issues.
35229
I have just booted my clean Ubuntu 18.04 LTS VM and tried to install some application with sudo apt install.  But got error message:     E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)       E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?   What process created the /var/lib/dpkg/lock-frontend file in Ubuntu? How to gently stop it and take manual control on APT?
120040
I am unable to add a repository via the command line on Ubuntu 14.04. Apt-get works perfectly fine, and I am able to update the system. I have configured my /etc/apt/apt.config file as follows:  Acquire::http::proxy "http://&lt;username&gt;:&lt;password&gt;@&lt;proxy address&gt;:&lt;port&gt;/";   For example, when trying to add the repository for y-ppa-manager, I receive:  add-apt-repository ppa:webupd8team/y-ppa-manager Cannot add PPA: 'ppa:webupd8team/y-ppa-manager'. Please check that the PPA name or format is correct.   If you need any more info., feel free to ask.
15236
when i run these: sudo apt-get install bitcoin  OR sudo apt-get install bitcoin-qt  i get &quot;E: Unable to locate package&quot; what do i do?
63182
working with procedure  to update Ubuntu 18.04 offline machine, the sudo apt-offline install /path_to_downloaded_package_folder do not apply any updates/upgrades. The beginning of the massage I get is :   sudo apt-offline install ./updates_path/ No changelog available (Y) Yes. Proceed with installation (N) No, Abort. (C) Display changelog (?) Display this help message. What would you like to do next:  (y, N, ?)y Proceeding with installation ERROR: Path for keyring is invalid: /etc/apt/trusted.gpg gpgv: Signature made Mon 06 Jan 2020 08:17:27 AM MST gpgv:                using RSA key 3B4FE6ACC0B21F32 gpgv: Good signature from "Ubuntu Archive Automatic Signing Key (2012) &lt;ftpmaster@ubuntu.com&gt;" gpgv: Signature made Mon 06 Jan 2020 08:18:52 AM MST gpgv:                using RSA key 3B4FE6ACC0B21F32 gpgv: Good signature from "Ubuntu Archive Automatic Signing Key (2012) &lt;ftpmaster@ubuntu.com&gt;" gpgv: Signature made Mon 06 Jan 2020 08:18:25 AM MST gpgv:                using RSA key 3B4FE6ACC0B21F32 gpgv: Good signature from "Ubuntu Archive Automatic Signing Key (2012) &lt;ftpmaster@ubuntu.com&gt;" gpgv: Signature made Thu 26 Apr 2018 05:38:40 PM MDT gpgv:                using RSA key 3B4FE6ACC0B21F32 gpgv: Good signature from "Ubuntu Archive Automatic Signing Key (2012) &lt;ftpmaster@ubuntu.com&gt;" security.ubuntu.com_ubuntu_dists_bionic-security_InRelease synced. security.ubuntu.com_ubuntu_dists_bionic-security_Release synced. security.ubuntu.com_ubuntu_dists_bionic-security_Release.gpg synced.   What am I doing wrong?
95603
I'm trying to install wine on Ubuntu Mate 18.04. Whenever I add the repository I get the error message      Blockquote E: The repository ' bionic Release' does not have a Release file.   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.   It's given the same error message for a few other programs I've tried to install too. Is it because 18.04 is so new it doesn't officially support it yet?
65215
FYI: I am using Kubuntu 18.04  I keep getting the following error when I install apt-transport-https  Things I have already tired to fix this error are:  sudo apt-get autoremove libdvd-pkg  sudo apt-get install libdvd-pkg sudo apt-get update sudo apt-get install -f sudo apt-get purge apt-transport-https &amp;&amp; sudo apt-get install apt-transport-https   The error I continue to see is  Reading package lists... Done Building dependency tree        Reading state information... Done The following packages will be REMOVED:   apt-transport-https* 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. After this operation, 152 kB disk space will be freed. Do you want to continue? [Y/n] Y (Reading database ... 246794 files and directories currently installed.) Removing apt-transport-https (1.6.6) ... libdvd-pkg: Checking orig.tar integrity... /usr/src/libdvd-pkg/libdvdcss_1.4.2.orig.tar.bz2: OK libdvd-pkg: `apt-get check` failed, you may have broken packages. Aborting... Reading package lists... Done Building dependency tree        Reading state information... Done The following NEW packages will be installed:   apt-transport-https 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 1,692 B of archives. After this operation, 152 kB of additional disk space will be used. Get:1 http://ca.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 apt-transport-https all 1.6.6 [1,692 B] Fetched 1,692 B in 0s (6,872 B/s)                Selecting previously unselected package apt-transport-https. (Reading database ... 246791 files and directories currently installed.) Preparing to unpack .../apt-transport-https_1.6.6_all.deb ... Unpacking apt-transport-https (1.6.6) ... Setting up apt-transport-https (1.6.6) ... libdvd-pkg: Checking orig.tar integrity... /usr/src/libdvd-pkg/libdvdcss_1.4.2.orig.tar.bz2: OK libdvd-pkg: `apt-get check` failed, you may have broken packages. Aborting...
83208
I did: sudo apt-get update  I got this: Reading package lists... Done E: Could not get lock /var/lib/apt/lists/lock. It is held by process 1131 (packagekitd)  N: Be aware that removing the lock file is not a solution and may break your system.  E: Unable to lock directory /var/lib/apt/lists/  I used to just remove the lock file, but I've never seen that note before (did it break my system?)?? What do I do?
52409
I was trying to recompile and rebuild libevent2 source from oneiric on my natty server and I had a small error with gpg not being able to check signature  # dpkg-source -x libevent_2.0.12-stable-1.dsc gpgv: Signature made Fri Jun 17 07:12:50 2011 PDT using DSA key ID 7ADF9466 gpgv: Can't check signature: public key not found dpkg-source: warning: failed to verify signature on ./libevent_2.0.12-stable-1.dsc   Any idea how to fix this warning?
2858
Does apt-get use https or any kind of encryption? Is there a way to configure it to use it?
70710
/dev/sda contains GPT signatures indicating that it has a GPT table. However, it has a fake msdos partition table as it should. Perhaps it was corrupted? Is this a GPT partition table?  So, that's the error message and this is during my first OS install of Ubuntu. Can close the message box. Can't click yes and can't click no. What do I do?
3632
I've added many PPAs using the add-apt-repository command. Is there a simple way to remove these PPAs? I've checked in /etc/apt/sources.list for the appropriate deb lines but they aren't there.   This is on a server system so a command line solution would be great!
31275
I cannot install any package. It seems the command apt-get update must be run but it throws some errors:  $ sudo apt-get update Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]      Hit:2 http://ve.archive.ubuntu.com/ubuntu xenial InRelease                      Hit:3 http://ve.archive.ubuntu.com/ubuntu xenial-updates InRelease              Hit:4 http://ve.archive.ubuntu.com/ubuntu xenial-backports InRelease            Fetched 102 kB in 23s (4337 B/s)                                                *** Error in `appstreamcli': double free or corruption (fasttop): 0x000000000210f4b0 *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fac8d8317e5] [...] Aborted (core dumped) Reading package lists... Done E: Problem executing scripts APT::Update::Post-Invoke-Success   'if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli;   then appstreamcli refresh &gt; /dev/null; fi' E: Sub-process returned an error code
84501
I am running 19.10 on a Lenovo flex 11 and all seems to be working smoothly. I regularly check for updates and often get something new installed apparently. Well, today I checked for updates and get the message "Failed to load repository information". My network connection is good...hello, my question is getting in here...so what is going on? Fetching e-mail works, surfing the web works, streaming works, but am unable to download repository information. What's up? results of update attempt:  tom@tom-Lenovo-FLEX-6-11IGM:~$ sudo apt update [sudo] password for tom:  Ign:1 http://dl.google.com/linux/earth/deb stable InRelease Hit:2 http://us.archive.ubuntu.com/ubuntu eoan InRelease                     Hit:3 http://us.archive.ubuntu.com/ubuntu eoan-updates InRelease             Hit:4 http://us.archive.ubuntu.com/ubuntu eoan-backports InRelease Get:5 http://dl.google.com/linux/earth/deb stable Release [933 B] Get:6 http://dl.google.com/linux/earth/deb stable Release.gpg [819 B] Hit:7 http://security.ubuntu.com/ubuntu eoan-security InRelease Ign:6 http://dl.google.com/linux/earth/deb stable Release.gpg Reading package lists... Done W: GPG error: http://dl.google.com/linux/earth/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13 E: The repository 'http://dl.google.com/linux/earth/deb stable Release' is not 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. tom@tom-Lenovo-FLEX-6-11IGM:~$   my ignorance is nearly complete, but it appears to me that something may be lacking in the place where updates live - I am grateful for the assistance I get here.
64908
I'm trying to update my system using apt-get, but it's giving me this error  Err http://bd.archive.ubuntu.com raring Release.gpg          Could not connect to bd.archive.ubuntu.com:80 (116.193.170.18), connection timed out Err http://bd.archive.ubuntu.com raring-updates Release.gpg   Unable to connect to bd.archive.ubuntu.com:http: Err http://bd.archive.ubuntu.com raring-backports Release.gpg   Unable to connect to bd.archive.ubuntu.com:http: Reading package lists... Done W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/raring/Release.gpg  Could not connect to bd.archive.ubuntu.com:80 (116.193.170.18), connection timed out W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/raring-updates/Release.gpg  Unable to connect to bd.archive.ubuntu.com:http: W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/raring-backports/Release.gpg  Unable to connect to bd.archive.ubuntu.com:http: W: Some index files failed to download. They have been ignored, or old ones used instead.   I am not a Ubuntu master but I can understand this is not a computer error. Any clues on how to fix it?