Venv + python3 + Ubuntu 16.04 = Время офигительных историй =)

Ну, такое... По порядку. 

Свежая система, python3, делаем python3 -m venv venv и получаем:

$ python3 -m venv venv
The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.
    apt-get install python3-venv
You may need to use sudo with that command.  After installing the python3-venv
package, recreate your virtual environment.
Failing command: ['/home/user/venv/venv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']

Ну что же, надо так надо. Делаем sudo apt-get install python3-venv, потом еще раз python3 -m venv venv, и...:

$ python3 -m venv venv
The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.
    apt-get install python3-venv
You may need to use sudo with that command.  After installing the python3-venv
package, recreate your virtual environment.
Failing command: ['/home/user/venv/venv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']

WTF??

Есть описание подобных проблем, с вариантами решений типа:

python3 -m venv myvenv --without-pip --system-site-packages
myvenv/bin/python3 -m pip install Django

Но, для начала... стоит проверить настройку локалей =) Забавно, но факт, строчки типа:

export LC_ALL="en_US.UTF-8" 

export LC_CTYPE="en_US.UTF-8" 

sudo dpkg-reconfigure locales

скопипащенные в консоль (с подстановкой локалей по вкусу) решают множество проблем в мгновение ока =)

MacOS High Sierra Homebrew Permission Denied

После обновления операционки пивоварня заболела..

Permission denied @ dir_s_mkdir - /usr/local/Frameworks

так же не хотела линковать python3 и прочее. Изменение прав целиком на /usr/local/ в новой ос запрещено.

Лечится все это дело в 3 строчки:

sudo mkdir /usr/local/include
sudo mkdir /usr/local/Frameworks

(на всякий случай, если и директории не создались..)

sudo chown -R $(whoami) $(brew --prefix)/*

а этим добиваем, и все пойдет как по маслу =)

Быстрофикс: E: Sub-process /usr/bin/dpkg returned an error code (1)

Бывают такие дни, когда важнее побыстрее избавиться от проблемы, а не разбираться и думать почему так получилось. Для таких дней эта заметка =)

И так, если вдруг все плохо:

$ sudo apt-get install SOMETHING
Reading package lists... Done
Building dependency tree      
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 kde-telepathy-minimal : Depends: kde-config-telepathy-accounts (>= 15.04.0) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

И даже предложенный способ фейлится:

$ sudo apt-get -f install
Reading package lists... Done
Building dependency tree      
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  linux-image-4.2.0-41-generic linux-image-extra-4.2.0-41-generic
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  kde-config-telepathy-accounts
The following NEW packages will be installed:
  kde-config-telepathy-accounts
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
2 not fully installed or removed.
Need to get 0 B/138 kB of archives.
After this operation, 828 kB of additional disk space will be used.
Do you want to continue? [Y/n]
(Reading database ... 555580 files and directories currently installed.)
Preparing to unpack .../kde-config-telepathy-accounts_4%3a15.08.2-0ubuntu1_amd64.deb ...
Unpacking kde-config-telepathy-accounts (4:15.08.2-0ubuntu1) ...
dpkg: error processing archive /var/cache/apt/archives/kde-config-telepathy-accounts_4%3a15.08.2-0ubuntu1_amd64.deb (--unpack):
 trying to overwrite '/usr/share/accounts/services/google-im.service', which is also in package account-plugin-google 0.12+15.10.20150723-0ubuntu1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/kde-config-telepathy-accounts_4%3a15.08.2-0ubuntu1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Быстрофикс: 

Идем в 

/var/lib/dpkg/info

и удаляем оттуда все что связано с проблемным пакетом:

$ rm account-plugin-google.* 

Проверяем результат:
$ sudo apt-get -f install
Reading package lists... Done
Building dependency tree      
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  linux-image-4.2.0-41-generic linux-image-extra-4.2.0-41-generic
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  kde-config-telepathy-accounts
The following NEW packages will be installed:
  kde-config-telepathy-accounts
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
2 not fully installed or removed.
Need to get 0 B/138 kB of archives.
After this operation, 828 kB of additional disk space will be used.
Do you want to continue? [Y/n]
dpkg: warning: files list file for package 'account-plugin-google' missing; assuming package has no files currently installed
(Reading database ... 555570 files and directories currently installed.)
Preparing to unpack .../kde-config-telepathy-accounts_4%3a15.08.2-0ubuntu1_amd64.deb ...
Unpacking kde-config-telepathy-accounts (4:15.08.2-0ubuntu1) ...
Setting up kde-config-telepathy-accounts (4:15.08.2-0ubuntu1) ...
Setting up kde-telepathy-minimal (15.04.20ubuntu1) ...
Setting up kde-telepathy (15.04.20ubuntu1) ...
Processing triggers for libc-bin (2.21-0ubuntu4.3) ...

$

Все работает. 

А дальше уже разбор полетов по желанию в свободное время.