The output of "cat /proc/cpuinfo":
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flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx fxsr_opt rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid tsc_known_freq pni ssse3 sse4_1 sse4_2 hypervisor lahf_lm cmp_legacy cr8_legacy 3dnowprefetch ssbd vmmcall fsgsbase arat
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VBoxManage setextradata "$vm_name" VBoxInternal/CPUM/IsaExts/AVX2 1
So, what should i do? Maybe someone has encountered this error?