ubuntu 16.04 - wkhtmltopdf error - QSslSocket: cannot resolve CRYPTO_num_locks

wkhtmltopdf error on ubuntu 16.04 :
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QSslSocket: cannot resolve CRYPTO_num_locks                  ] 10%
QSslSocket: cannot resolve CRYPTO_set_id_callback
QSslSocket: cannot resolve CRYPTO_set_locking_callback
QSslSocket: cannot resolve sk_free
QSslSocket: cannot resolve sk_num

Solution :

sudo apt-get install libssl-dev=1.0.2g-1ubuntu4.10 openssl=1.0.2g-1ubuntu4

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

Ruby Error while installing charlock_holmes 

Error :
Fetching charlock_holmes 0.7.5
Installing charlock_holmes 0.7.5 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.


Solution : 1
If you are using debian or ubuntu

sudo apt-get install libicu-dev

If you are using Centos or fedora

sudo yum install libicu-devel

Solution : 2
Try to install other version of charlock_holmes

gem pristine charlock_holmes --version 0.6.9.4

or

gem install charlock_holmes -v '0.6.9'

Skipping ssh-dss key id_dsa - not in PubkeyAcceptedKeyTypes

SSH keeps skipping my pubkey and asking for a password

You have correct ssh key but still it is asking password to login or if password authentication is prohibited, it stopped accepting correct keys.

If it was working before and suddenly it starts giving above error, it means you have upgraded your openssh. The new openssh version - 7.0+ does not support DSA keys anymore  (Neither on server nor on client). 

If openssh client has been upgraded and openssh server still supports DSA keys, make the changes in client side ssh config.

Solution  :

sudo nano /etc/ssh/ssh_config

Add following line in the file.

PubkeyAcceptedKeyTypes=+ssh-dss

Restart ssh.

If openssh server has been upgraded and openssh client still supports DSA keys, make the changes in server side sshd config.

Solution  :

sudo nano /etc/ssh/sshd_config

Add following line in the file.

PubkeyAcceptedKeyTypes=+ssh-dss

Restart ssh.

Note :  The best solution, you must use RSA keys. It has strong and secure algorithm and it is better than the patch you are finding.