Ubuntu – Updating to latest gcc and g++ on Ubuntu 16.04

aptg++gcc

I recently tried to downgrade to gcc 4.7 since a cfd code I was working on didn't compile with the latest gcc version. But after many errors and the code still not compiling I gave up and would like to go back to the latest gcc and g++ compilers however it seems I may have messed something up.

When I do:

sudo update-alternatives --remove-all gcc 
sudo update-alternatives --remove-all g++
sudo apt-get install gcc-6.2 g++-6.2

or even gcc-5.1 g++-5.1 for that matter, it gives me the following error

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package gcc-6.2
E: Couldn't find any package by glob 'gcc-6.2'
E: Couldn't find any package by regex 'gcc-6.2'
E: Unable to locate package g++-6.2
E: Couldn't find any package by glob 'g++-6.2'
E: Couldn't find any package by regex 'g++-6.2'

and I also tried doing this before

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-6.2 g++-6.2

but it doesn't seem to work.
Finally when I just do

sudo apt-get install gcc

it says

Reading package lists... Done
Building dependency tree       
Reading state information... Done
gcc is already the newest version (4:5.3.1-1ubuntu1).

I know I still need to install and configure alternatives but doing that doesn't work either as follows

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5.3 10
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-5.3 10
sudo update-alternatives --install /usr/bin/cc cc /usr/bin/gcc 30
sudo update-alternatives --set cc /usr/bin/gcc
sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++ 30
sudo update-alternatives --set c++ /usr/bin/g++
sudo update-alternatives --config gcc
sudo update-alternatives --config g++

Sorry this ended up quite long and please let me know if you need more info. Thanks!

EDIT: I actually got it to work by changing gcc-5.3 to gcc-5 in the above code as that seemed to be what it's called in usr/bin. I will keep it for future reference if anyone faces the same problem.

Best Answer

Run the following commands in sequence. I was getting same error. This worked for me.

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-snapshot
sudo apt-get install gcc-6 g++-6

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Ubuntu – How to fix this dependency issue that broke Makerware with the last update

I installed aptitude and got these proposed solutions:

$ sudo aptitude install makerware
The following NEW packages will be installed:
  avrdude{a} conveyor{a} conveyor-common{a} conveyor-ui{a} libarmadillo4{a} 
  libarpack2{a} libboost-program-options1.54.0{a} libcoin80{a} libdap11{a} 
  libdapclient3{a} libdigitizer{a} libepsilon1{a} libfreexl1{a} libftdi1{a} 
  libgdal1h{a} libgeos-3.4.2{a} libgeos-c1{a} libgraphicsmagick3{a} 
  libhdf4-0-alt{a} libhdf5-7{a} libjsoncpp0{a} libkml0{a} libmbqtutils{a} 
  libmysqlclient18{a} libnetcdfc7{a} libogdi3.2{a} libopenmesh-3.2{a} 
  libopenscenegraph99{a} libopenthreads14{a} libpq5{a} libproj0{a} 
  libqt5multimedia5{ab} libqt5multimediawidgets5{a} libspatialite5{a} 
  libthing{a} libtinything{a} libtoolpathviz{a} liburiparser1{a} 
  libxerces-c3.1{a} libxine2{a} libxine2-bin{a} libxine2-doc{a} 
  libxine2-ffmpeg{a} libxine2-misc-plugins{a} libxine2-plugins{a} 
  makerbot-driver{a} makerware mb-libjsonrpc{a} mb-libopencv2.4{a} 
  mb-libstdc++6{a} mb-libvtk5.10{a} mb-pyserial{a} miracle-grue{a} 
  mysql-common{a} proj-bin{a} proj-data{a} 
0 packages upgraded, 56 newly installed, 0 to remove and 0 not upgraded.
Need to get 206 MB/206 MB of archives. After unpacking 340 MB will be used.
The following packages have unmet dependencies:
 libqt5multimedia5 : Depends: qtbase-abi-5-2-1 which is a virtual package.
The following actions will resolve these dependencies:

     Keep the following packages at their current version:
1)     libqt5multimedia5 [Not Installed]                  
2)     libqt5multimediawidgets5 [Not Installed]           
3)     makerware [Not Installed]                          



Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:

      Remove the following packages:                                            
1)      libqt5help5                                                             
2)      libqt5xmlpatterns5                                                      
3)      musescore                                                               
4)      qml-module-qtquick-localstorage                                         
5)      qml-module-qtquick-window2                                              
6)      qml-module-qtquick2                                                     
7)      qml-module-qtwebkit                                                     

      Install the following packages:                                           
8)      libqt5positioning5 [5.2.1-1ubuntu2 (now, trusty)]                       
9)      libqt5sensors5 [5.2.1+dfsg-2ubuntu2 (now, trusty)]                      

      Downgrade the following packages:                                         
10)     libqt5clucene5 [5.3.0-5~trusty1 (now, trusty) -> 5.2.1-8build1 (trusty)]
11)     libqt5core5a [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-1u
12)     libqt5dbus5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-1ub
13)     libqt5gui5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-1ubu
14)     libqt5network5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-
15)     libqt5opengl5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-1
16)     libqt5printsupport5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+
17)     libqt5qml5 [5.3.0-3ubuntu13~trusty1 (now, trusty) -> 5.2.1-3ubuntu15.1 (
18)     libqt5quick5 [5.3.0-3ubuntu13~trusty1 (now, trusty) -> 5.2.1-3ubuntu15.1
19)     libqt5sql5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-1ubu
20)     libqt5sql5-sqlite [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+df
21)     libqt5svg5 [5.3.0-2~trusty1 (now, trusty) -> 5.2.1-1 (trusty)]          
22)     libqt5test5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-1ub
23)     libqt5webkit5 [5.3.0+dfsg-1ubuntu2~trusty1 (now, trusty) -> 5.1.1-1ubunt
24)     libqt5webkit5-qmlwebkitplugin [5.3.0+dfsg-1ubuntu2~trusty1 (now, trusty)
25)     libqt5widgets5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-
26)     libqt5xml5 [5.3.0+dfsg-2ubuntu9~trusty1 (now, trusty) -> 5.2.1+dfsg-1ubu
27)     qtdeclarative5-localstorage-plugin [5.3.0-3ubuntu13~trusty1 (now, trusty
28)     qtdeclarative5-qtquick2-plugin [5.3.0-3ubuntu13~trusty1 (now, trusty) ->
29)     qtdeclarative5-window-plugin [5.3.0-3ubuntu13~trusty1 (now, trusty) -> 5



Accept this solution? [Y/n/q/?]

It seems that when I added the repository for MuseScore and upgraded MuseScore to 2.0, it also updated qt to 5.3 which seems to be incompatible with Makerware.

For now, it looks like I have to downgrade MuseScore or not use Makerware.

Ubuntu – Unable to locate package thesql-server

Whenever u install fresh Ubuntu , you need to update and upgrade the system to install from ubuntu repositories.

sudo apt-get update && sudo apt-get dist-upgrade

Now install anything

 sudo apt-get install mysql-server

Best Answer

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Ubuntu – How to fix this dependency issue that broke Makerware with the last update

Ubuntu – Unable to locate package thesql-server

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