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lang-bash
$XAUTHORITYis still set to user1's~/.Xauthority, which the program, I guess, will try to read, and it fails because that file typically has mode 0600 (-rw-------), meaning it's unavailable for reading by anyone in the "other" group, which includes user2. Meaning if youchmod o+r ~/.Xauthority(as user1), you will have hacked your way around this problem. I wrote a script that demonstrates this.