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It's a normal error: the dpkg needs to obtain a global and system-wide lock to be sure that no installation process will mess one another, so they will be done in a serial way being run one by one. It's also true for any mainstream package manager like yum, rpm et cetera. It's OK to do a sudo for install: the installation script will create a separate ...


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Maybe try hCaptcha. It's an alternative to Google's ReCaptcha. From their website: "It is the most popular reCAPTCHA alternative"


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