ssh error - Agent admitted failure to sign using the key

Solution : 1

ssh login using command

SSH_AUTH_SOCK=0 ssh server-ip

Example : SSH_AUTH_SOCK=0 ssh username@192.168.0.xx

Solution : 2

Run Command

Ubuntu Boot Error - Fixing Recursive Fault Issue

Solution :

sudo nano /etc/default/grub
Change the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"
And then update grub
sudo update-grub

PHP Parse error: syntax error, unexpected '$value' (T_VARIABLE)

PHP Parse error:  syntax error, unexpected '$value' (T_VARIABLE)

If you are getting this error for specific php keywords used in code like yield, you need to upgrade your php version. May be you have php 5.4 or lower version, upgrade it to php 5.5 or php 5.6 or higher.
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