The COVID-19 pandemic has significantly changed Indonesia's educational system, including its universities. In all subjects, including mathematics, face-to-face learning systems must be transformed into online learning systems. The purpose of this study is to examine student responses to online lectures delivered during the Covid-19 pandemic. The study employed a descriptive qualitative method, with 30 students enrolled in high-grade mathematics courses. The data collection process included document analysis, observation, and questionnaire-assisted interviews. After that, the data were analyzed using descriptive statistics techniques and presented in diagrams and narration. The results revealed that the online lecture process incorporated a digital platform, including video conferencing via Zoom, cloud meetings, WhatsApp, and the University's Lumen. The majority of students dislike online learning, even though the lectures are delivered like face-to-face lectures. They dislike online courses for two primary reasons: the unstable quality of the internet network and difficulty comprehending subject concepts.