Questions tagged [16.04]

Sixth LTS (Long Term Support) release of Ubuntu, code-named "Xenial Xerus". Released on 21st April, 2016. Reached End of Standard Support (ESM) on April 30, 2021. Questions specific to 16.04 are no longer supported here and are supposed to be closed as off-topic.

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249
votes
20answers
332k views

Ubuntu 16.04 ssh: sign_and_send_pubkey: signing failed: agent refused operation

I just upgraded my Ubuntu System from 15.10 to 16.04 by completely wiping the Ubuntu 15 partition from my system. After installing Ubuntu 16.04 I recreated my ssh keys as I forgot to back them up, ...
211
votes
11answers
157k views

Annoying flickering in 16.04 LTS - Chrome

I've upgraded from 4.4.0 to 4.4.8 and then 4.5.2 on Ubuntu 16.04 LTS 64-bit, and it's still happening. At 4.5.2 it's even more frequent, and mainly in Chrome (haven't tried firefox or opera just yet)...
203
votes
5answers
106k views

Avoiding user interaction with tzdata when installing certbot in a docker container

I want to install certbot in a docker environment with an Ubuntu 16.04 image: For example: docker run -it ubuntu:16.04 /bin/bash When I'm inside the container, the most straightforward way to ...
180
votes
4answers
565k views

How can I downgrade from PHP 7 to PHP 5.6 on Ubuntu 16.04? [duplicate]

I am trying to revert my PHP version to 5.6 from 7 and though I removed PHP 7 and then installed PHP 5.6 I still seem to be running version 7. Is there a simple method for moving through PHP versions ...
163
votes
12answers
136k views

Wifi doesn't work after suspend after 16.04 upgrade

This particular version of the "doesn't work after suspend" came after upgrading to 16.04. It seems that the upgrade includes a Wicd applet (added to Metacity Classic Gnome task bar alongside regular ...
151
votes
8answers
216k views

Could not load 'vboxdrv' after upgrade to Ubuntu 16.04 (and I want to keep secure boot)

I upgrade from Ubuntu 15.10 to 16.04 and since then VirtualBox 5.0.18 isn't starting my VMs anymore. It complains that 'vboxdrv' isn't loaded. So I try to load it and get the following error: $ sudo ...
134
votes
7answers
387k views

How to completely uninstall docker

I followed the uninstall instructions here. Then I ran these commands: sudo apt-get purge docker-engine sudo apt-get autoremove --purge docker-engine rm -rf /var/lib/docker So after I did all this I ...
134
votes
10answers
209k views

16.04 upgrade broke mysql-server

My overall upgrade went well, but I am left with a critically lingering issue of mysql-server not being able to install itself, and nothing I am trying gets it to work. This is the error I see when ...
134
votes
7answers
543k views

How do I install Adobe Acrobat in Ubuntu 16.04?

I know the thread How do I install Adobe Acrobat Reader deb package downloaded from Adobe website? However, there is no Linux anymore in the installation site here. Unsuccessful attempts I do ...
123
votes
9answers
396k views

16.04 LTS wifi connection issues with Realtek RTL8723BE adapter

I discovered several issues with wifi connection after installing 16.04 LTS. First, wifi doesn't reconnect normally after sleep or hibernation. Sometimes the network icon turns into a "up and down ...
111
votes
8answers
285k views

How can I install CuDNN on Ubuntu 16.04?

For TensorFlow I would like to install cuda and CuDNN. How do I do that on Ubuntu 16.04?
111
votes
11answers
204k views

How can I hibernate on Ubuntu 16.04?

How should I successfully hibernate Ubuntu 16.04? I've tried almost every solution on the web but non of them was actually helpful. I found my problem almost completely similar to this one
105
votes
1answer
187k views

Clock shows wrong time after switching from Ubuntu to Windows 10 [duplicate]

I have dual booted Windows 10 and Ubuntu 16.04 in UEFI mode (secure boot off). My time in BIOS is correct. When I boot into Ubuntu and then boot into Windows 10, it shows the wrong time. I have to ...
104
votes
9answers
290k views

Ubuntu 16.04 hangs on shutdown/restart

My Ubuntu 16.04 hangs on shutdown/restart requiring me to press and hold the power key to turn the machine off... I don't know how to report this as a bug and what commands to run to show the ...
103
votes
10answers
213k views

Steam not opening in Ubuntu 16.04 LTS

I have never used Ubuntu or any other Linux OS before last Friday. For all I know, I might have installed Ubuntu wrong and be missing a component. I would prefer if you use simplest terminology ...
102
votes
0answers
499k views

How to install skype in ubuntu 16.04 [duplicate]

How to install skype in ubuntu 16.04? Please provide step by step process for installation.
101
votes
3answers
140k views

netstat or alternative in docker ubuntu server 16.04 container

Was netstat removed in 16.04? Is there an alternative to netstat available in 16.04? Or how do I install netstat in 16.04? I am running an ubuntu:16.04 container in docker for Windows, it seems that ...
100
votes
8answers
212k views

systemctl failed to connect to bus - docker ubuntu:16.04 container

I'm trying to use the systemctl command in a ubuntu:16.04 docker container. I'm running the following command... systemctl status ssh However I'm getting the error... Failed to connect to bus: No ...
99
votes
13answers
519k views

How can I install CUDA on Ubuntu 16.04?

For TensorFlow I would like to install CUDA. How do I do that on Ubuntu 16.04?
96
votes
6answers
179k views

Ubuntu 15.10 and 16.04 keep freezing randomly

This issue i had it with 15.10 and it's still here after the 16.04 upgrade. The whole system freezes, no keyboard/mouse input works anymore. I tried a variety of keyboard combinations (found on the ...
93
votes
4answers
93k views

Pair Bose QuietComfort 35 with Ubuntu over Bluetooth

In System Settings > Bluetooth, the Bose QC 35 is visible when searching for devices but pairing fails. After multiple attempts and playing with the PIN options I managed to pair it but once selected ...
93
votes
3answers
155k views

Possible missing frmware /lib/firmware/i915

I upgraded my laptop to have the 4.8 kernel and during the process the following warnings came up. update-initramfs: Generating /boot/initrd.img-4.8.0-040800-generic W: Possible missing firmware /lib/...
91
votes
2answers
122k views

Bluetooth - Connection Failed: blueman.bluez.errors.DBusFailedError: Protocol Not available

I'm trying to add a BlueParrott B-250XT+ bluetooth headset on a Thinkpad X230 tablet running Ubuntu 16.04 with its hardware bluetooth adapter. The adapter works - meaning it detects/sees the headset. ...
85
votes
12answers
249k views

16.04 new installation gives grub-efi-amd64-signed failed installation /target/ ubuntu 16.04 at the end

I am installing Ubuntu 16.04 in an Intel NUC computer with UEFI enabled. I am using an SSD from another computer. During the installation I chose Erase the disk and make a new full install At the end ...
85
votes
6answers
182k views

“W: Possible missing firmware for module i915_bpo” when updating initramfs

When I run a kernel or NVIDIA driver update on my 16.04, this triggers an initramfs rebuild which outputs the warning below: Processing triggers for initramfs-tools (0.122ubuntu8.1) ... update-...
82
votes
8answers
123k views

Why does installing node 6.x on Ubuntu 16.04 actually install node 4.2.6?

These were my steps to install node on Ubuntu 16.04: curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash - sudo apt-get install -y nodejs sudo apt-get install -y npm which are the official ...
79
votes
5answers
77k views

Chrome freeze very frequently with ubuntu 16.04

I am using chrome Version 50.0.2661.94 (64-bit) and ubuntu 16.04. Most of the time chrome get stuck and hangs whole system. Does anyone face the same issue?
73
votes
10answers
127k views

VirtualBox - RTR3InitEx failed with rc=-1912 (rc=-1912)

I have installed VirtualBox Version 5.1.18 r114002 (Qt5.5.1) on Ubuntu 16.04 LTS. To virtualize everything (Kali, Windows 10). I encounter the following error: RTR3InitEx failed with rc=-1912 (rc=...
71
votes
7answers
210k views

Upgrade to 16.04. php7 not working in browser

I just upgraded from 14.10 to 16.04 and am not sure how to configure PHP 7 in apache. I did modify the php7.0.conf file to uncomment that last lines, restarted apache2 and no change. Do I need to ...
70
votes
9answers
243k views

How to install VirtualBox Guest Additions for Ubuntu 16.04

What is the best way to install Guest Additions with all the resize and clipboard and file sharing features on Ubuntu 16.04?
69
votes
1answer
82k views

pkg-config not finding gtk+-3.0

States here that the package gtk+-3.0 was not found: karl@karl-ux303ln:~$ pkg-config --cflags gtk+-3.0 Package gtk+-3.0 was not found in the pkg-config search path. Perhaps you should add the ...
69
votes
4answers
56k views

how I can fix “AppStream cache update completed, but some metadata was ignored due to errors.”?"

I executed apt update as root, but I received this error message: AppStream cache update completed, but some metadata was ignored due to errors. I have found this link that offer a solution editing ...
68
votes
3answers
202k views

PCIe Bus error severity=Corrected

I have a new HP Pavilion Gaming Notebook and a new installation of Ubuntu 16.04. When I press Ctrl + Alt + F1 I go start seeing the errors shown in the following image and it doesn't allow me to ...
67
votes
1answer
186k views

Upgrade to the specific php 7.1/7.2 from php 7.0 in Ubuntu 16.04 [duplicate]

How can I upgrade to php 7.1 from php 7.0 in ubuntu 16.04 ? If I do a php -v I get this message: PHP 7.0.8-0ubuntu0.16.04.3 (cli) ( NTS ) Copyright (c) 1997-2016 The PHP Group Zend Engine v3.0.0, ...
66
votes
1answer
53k views

Difference between systemctl init.d and service

I am new to linux and have been testing myself using an Amazon Lightsail instance (Ubuntu 16.04 LTS). Going through the many guides I have came across, I see people using different commands to start/...
65
votes
3answers
72k views

Nautilus won't launch [16.04]

If I try to launch Nautilus in whatever way (from Unity, Terminal), it doesn't launch. Terminal gives me these outputs: launch name@machine:~$ nautilus (nautilus:4367): GLib-GIO-ERROR **: Settings ...
65
votes
7answers
84k views

Slow shutdown on Ubuntu 16.04 LTS (Stopping thermal daemon/running fit make remote CUPS printers)

After a clean install of Ubuntu 16.04 LTS, I am experiencing very slow shutdowns compared with 15.10. There seems to be one of two processes that hang upon shutdown. Startup is not affected at all. ...
63
votes
9answers
115k views

Nginx installation error in Ubuntu 16.04

:~$ sudo apt-get remove nginx* && sudo apt-get install nginx-full* Reading package lists... Done Building dependency tree Reading state information... Done After this operation, 5,579 kB of ...
63
votes
10answers
187k views

Cannot change brightness (Ubuntu 16.04 LTS, Unity)

I'm new to Linux systems in general (I'm using Ubuntu 16.04 LTS) and I'm having difficulty in changing the brightness of my notebook. When I use the Fn+F8 or Fn+F9 the brightness bar shows up but ...
63
votes
7answers
154k views

How do I install Docker on Ubuntu 16.04 LTS?

I would like to build and run Docker containers on Ubuntu 16.04 LTS. How do I install Docker?
62
votes
3answers
37k views

Nautilus not opening up, showing GLib error

When I launch nautilus from terminal the following error is printed and nautilus doesn't open up. (nautilus:25179): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->...
61
votes
7answers
78k views

Eclipse not working in 16.04

Eclipse was working as good as anything on 14.04. I did a clean install of 16.04 and installed Eclipse. But it runs a Java program only once after which it just hangs during subsequent attempts before ...
59
votes
1answer
116k views

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY [duplicate]

When I run apt-get update, I get this error message: Err:18 http://dl.google.com/linux/chrome/deb stable Release.gpg The following signatures couldn't be verified because the public ...
59
votes
7answers
197k views

Cannot boot system due to start job running for hold

I've installed ubuntu-desktop on Ubuntu 16.04 Gnome and I picked lightdm and now once I restart, I get this error message when I press CTRL + ALT + F2: A start job is running for Hold until boot ...
58
votes
2answers
252k views

How to disable Nouveau kernel driver

When installing CUDA in Ubuntu 16.04 by executing cuda_8.0.44_linux.run, I got the following error message in /var/log/nvidia-installer.log Then I checked /etc/modprobe.d/nvidia-installer-disable-...
58
votes
1answer
349k views

systemctl: command not found on ubuntu 16.04

when I tried to install RocketChat in Ubuntu 16.04 In Command Prompt I enter. systemctl enable mongod After That I got The issue. systemctl: command not found How to solve this?
58
votes
4answers
88k views

14.04 --> 16.04 failed; apt (>= 1.0.1ubuntu2.13)' is not installed

(This question was not resolved. Due to time constraints Computer was restored to factory settings.) I was attempting to upgrade from 14.04 to 16.04, but apt threw this error: The required ...
57
votes
9answers
138k views

Ubuntu 16.04 won't output sound to Bluetooth headphones

I'm trying to use mt SONY MDR-XB950BT headphones on Ubuntu 16.04 but not having any luck. I've managed to get them connected but it doesn't seem like I can actually listen to music/videos out of them. ...
56
votes
3answers
65k views

User limit of inotify watches reached on Ubuntu 16.04

I just installed Ubuntu 16.04 and I get this warning when I start SmartGit: IOException: User limit of inotify watches reached Moreover I get this warning launching tail -f: tail: inotify resources ...
56
votes
4answers
19k views

Is 'apt-get' deprecated?

Lately, I've seen many people use sudo apt instead of sudo apt-get Also, Ubuntu keeps telling me to install things by sudo apt The program 'foo' is currently not installed. You can install it by ...

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