I was trying to add an PPA repository and got this error on a server:
$ sudo add-apt-repository ppa:blah/foobar
sudo: add-apt-repository: command not found
The add-apt-repository comes from the
software-properties-common package. Installing it solved the problem:
$ sudo apt install software-properties-common
Tried with: Ubuntu 16.04
Installing a package with Pip on a new computer gave this error:
ImportError: No module named 'setuptools'
$ sudo apt install python-setuptools
$ sudo apt install python3-setuptools
Tried with: Ubuntu 16.04
NVIDIA Docker makes it easy to use Docker containers across machines with differing NVIDIA graphics drivers. After installing it, I ran a sample NVIDIA Docker command and got this error:
$ nvidia-docker run --rm nvidia/cuda nvidia-smi
docker: Error response from daemon: Post http://%2Frun%2Fdocker%2Fplugins%2Fnvidia-docker.sock/VolumeDriver.Mount: dial unix /run/docker/plugins/nvidia-docker.sock: connect: no such file or direct
Investigating the log files showed this:
$ cat /tmp/nvidia-docker.log
nvidia-docker-plugin | 2017/10/11 10:10:07 Loading NVIDIA unified memory
nvidia-docker-plugin | 2017/10/11 10:10:07 Loading NVIDIA management library
nvidia-docker-plugin | 2017/10/11 10:10:07 Discovering GPU devices
nvidia-docker-plugin | 2017/10/11 10:10:13 Provisioning volumes at /var/lib/nvidia-docker/volumes
nvidia-docker-plugin | 2017/10/11 10:10:13 Serving plugin API at /run/docker/plugins
nvidia-docker-plugin | 2017/10/11 10:10:13 Serving remote API at localhost:3476
nvidia-docker-plugin | 2017/10/11 10:10:13 Error: listen tcp 127.0.0.1:3476: bind: address already in use
That 3476 port turned out to be owned by no process. So what’s the problem?
I gave up and restarted Docker and everything worked fine after that (haha!):
$ sudo service docker restart
Tried with: NVIDIA Docker 1.x and Docker 1.11
A Docker pull command to Docker hub that worked fine for all users failed only for one user. When she tried to pull, it threw up this error:
repository some_org/some_image not found: does not exist or no pull access
The push refers to a repository [docker.io/some_org/some_image]
Docker hub authentication and other details seemed to be in order.
Turns out this user had run some docker commands before adding the Docker hub authentication. Those early commands had created a
~/.docker directory. Details from this were conflicting with Docker hub authentication that was introduced later. Removing this directory fixed the issue.
Tried with: Docker 1.11 and Ubuntu 14.04
C++ code that uses Boost Filesystem was compiling fine with Boost 1.49. However, when I switched to Boost 1.55, the same code gave this error:
foobar.cpp.o: In function `do_something()':
foobar.cpp:(.text+0xb78): undefined reference to `boost::filesystem::detail::copy_file(boost::filesystem::path const&, boost::filesystem::path const&, boost::filesystem::copy_option, boost::system::error_code*)'
This was surprising since the declaration of the
copy_file method was present in
libboost_filesystem.so was linked during compilation.
Turns out this is a known bug with Boost Filesystem as described here. Apparently, this happens only if the C++ code is compiled with the
-std=c++11 option. I was indeed using that option.
The current fix for this bug is to temporarily disable the C++ scoped enums when the Boost Filesystem header file is included, like this:
Tried with: Boost 1.55, GCC 4.8.4 and Ubuntu 14.04
I wanted to share a directory that was on my local computer to a remote computer named
medusa using NFS. I did the setup of the NFS server on my local computer and NFS client on the remote computer as described here. However, when I mounted the NFS share on the remote computer, I got this error:
$ sudo mount /mnt/my_nfs_share
mount.nfs: access denied by server while mounting my-local-computer:/path/i/shared
This turned out to be tricky one! The error message is quite a bit misleading because it turned out that the problem had nothing to do with access. Turns out this remote computer
medusa had two Ethernet cards and thus two IP addresses. One of the IP addresses was set to the hostname
medusa, but the NFS client was using the second IP address.
The solution was to add the second IP address
192.168.0.100 as an entry in the
The rest of the steps I repeated as described in this post. Everything worked fine and I was able to mount the NFS share on the remote computer.
Tried with: Ubuntu 14.04
I had a Python script that used Caffe2. It worked fine on one computer. On another computer with same setup, it would fail at the
import caffe2.python line with this error:
WARNING:root:This caffe2 python run does not have GPU support. Will run in CPU only mode.
WARNING:root:Debug message: dlopen: cannot load any more object with static TLS
CRITICAL:root:Cannot load caffe2.python. Error: dlopen: cannot load any more object with static TLS
As I mentioned above, the GPU support warning is a red herring cause this Caffe2 Python was built with GPU support. The real error is the dlopen.
The only solution from Googling that gave a clue was this. As suggested there, I placed the
import caffe2.python line at the top above all other imports. The error disappeared.
Tried with: Ubuntu 14.04
I had an binary compiled on Ubuntu 14.04. I tried to run it on Ubuntu 16.04 and got this error:
OGRE EXCEPTION(7:InternalErrorException): Could not load dynamic library /usr/lib/x86_64-linux-gnu/OGRE-1.8.0/RenderSystem_GL
From the error, I could see that it was looking for an OGRE library file. I installed the OGRE library available on Ubuntu 16.04:
$ sudo apt install libogre-1.9-dev
The error still persisted, because Ubuntu 16.04 only has OGRE 1.9, while this binary was looking for OGRE 1.8 library files.
I tried to create a symbolic link of an OGRE 1.8 directory to the existing OGRE 1.9 directory:
$ cd /usr/lib/x86_64-linux-gnu/
$ ln -s OGRE-1.9.0 OGRE-1.8.0
This worked! The executable ran without problems. This saved me from having to build OGRE 1.8 from source on this computer.
I tried to train a model using Caffe on a remote computer. The training proceeded without any problems, but this error would show up in the console output occasionally:
Could not create logging file: No such file or directory
COULD NOT CREATE A LOGGINGFILE 20170221-111719.33617!I0221 11:17:19.399444 33617 solver.cpp:243] Iteration 86860, loss = 3.38734
This error turned out to be from GLog, the Google logging module. Caffe uses GLog for its logging. On this particular remote computer, the
GLOG_log_dir environment variable had been set, but to a non-existent path! This was the reason GLog was complaining. Once I removed this environment variable and restarted the training, I no longer saw the error.
Tried with: Ubuntu 14.04
I had a computer with Ubuntu 16.04 running the Unity desktop. I wanted to switch to Kubuntu, so I installed it using this command:
$ sudo apt install kubuntu-desktop
Everything installed fine, except this error at the end:
kde-telepathy-minimal : Depends: kde-config-telepathy-accounts (>= 0.9.0) but it is not installed
After this, there is an error about
kaccounts-provider whenever I login into Unity. If I try to login into the KDE desktop, I get a blank display!
This error seems to be hitting lots of people as seen here. This seems to be caused by a conflict between packages required by Unity and KDE. Apparently, Unity (Ubuntu) and KDE (Kubuntu) cannot be installed on the same computer!
Following some clues given by other users, I forcefully removed Telepathy since I did not need it anyway:
$ sudo dpkg --remove kde-telepathy
$ sudo apt update
$ sudo apt dist-upgrade
After this the Unity error on login and the black display in KDE went away. I was able to switch to using KDE as my primary desktop.
So, if you intend to use Kubuntu, you are better off installing a Kubuntu ISO directly instead of installing it from inside Ubuntu.